T X 



*b 



DEPARTMENT OF AGRICULTURE. 
bur: 3ISTRY— b v: 100. 



•S5S 



SOME FORMS OF Fool) ADULTERATION 



SIMPLE METHODS FOE THEIR DETECTTok 



W. D. BIGELOW. 
I 

j AKJQ 

BURTON J. HOWARD 

XOOTV. 




WASHINGTON: 

tJOVBKXMEKT PRINTING OFFICE. 
LI, 




/?// 







Reprint September 12, 1911 

U. S. DEPARTMENT OF AGRICULTURE. 



BUREAU OF CHEMISTRY— BULLETIN No. 100. 

H. W. WILEY. Chief. 



ni 



SOME FORMS OF FOOD ADULTERATION 



SIMPLE METHODS FOR THEIR DETECTION. 



W. D. BIGELOW, 

Chief, Division of Foods, 
AND 

BURTON J. HOWARD, 

Chief, Microchemical Laboratory. 




WASHINGTON: 

GOVERNMENT PRINTING OFFIC! 
1911. 



\ 






LETTER OF TRANSMITTAL. 



U. S. Department of Agriculture, 

Bureau of Chemistry, 
Washington, D. C. March 1-2. 1906. 
Sir: I have the honor to submit for your approval a manuscript on 
food adulteration and simple methods for the detection of some of its 
more prevalent forms. This bulletin has been prepared to meet the 
numerous demands which are received for nontechnical information of 
this character, and it is believed that it will be of service both to 
housekeepers and to dealers. I recommend the publication of this 
report as Bulletin No. 100 of the Bureau of Chemistry. 
Respectfullv, 

H. W. Wiley. Chief. 
Hon. James Wilson. 

Secretary of Agriculture. 

3 



CONTEXTS. 



Page. 

General discussion 7 

Public opinion 7 

' 'Adulteration ' ' denned 8 

Chemical preservatives 11 

Coloring matter 12 

Forms of adulteration of specific foods 14 

Baking powder and baking-powder chemicals 14 

Beverages 15 

Alcoholic 15 

Nonalcoholic 16 

Canned vegetables _ 16 

Cereal products 13 

Breakfast foods 18 

Flour 19 

Cocoa and chocolate 19 

Coffee and tea 20 

Condimental sauces 21 

Dairy products 22 

Butter 22 

Cheese 23 

Cream 23 

Milk 24 

Edible fats and oils 26 

Flavoring extracts 28 

Fruit products 29 

Meat preparations 31 

Spices 33 

Sugars, sirups, etc 37 

Vinegar 40 

Simple tests for the detection of food adulterants 41 

Introduction 41 

Chemical reagents 42 

Determination of preservatives 43 

Detection of salicylic acid 43 

Detection of benzoic acid 44 

Detection of boric acid and borax . 44 

Detection of formaldehyde 45 

Detection of saccharin 45 

Determination of artificial colors 45 

Detection of coal-tar dyes 45 

Detection of copper 46 

Detection of turmeric 47 

Detection of caramel 48 



6 CONTENTS. 

Simple tests for the detection of food adulterants — Continued. Page. 

Examination of certain classes of foods 48 

Canned vegetables 48 

Coffee 49 

Physical tests 49 

Chemical tests 50 

Condimental sauces 50 

Dairy products 50 

Butter 50 

Milk 51 

Detection of water 52 

Detection of color 52 

Detection of formaldehyde 52 

Edible oils 53 

Detection of cottonseed oil 53 

Eggs ' 53 

Flavoring extracts 54 

Vanilla extract 54 

Detection of caramel 54 

Examination of resin 55 

Lemon extract 55 

Flour 56 

Tests for bleaching 56 

.Method I (for nitrites) 56 

.Method II (for color of oil) 57 

Fruit products 57 

Detection of starch 57 

Detection of glucose 57 

Detection of foreign seeds 58 

Detection of preservatives and colors 58 

Meat products 58 

Detection of boric acid and borax 58 

Detection of colors 59 

Spices 59 

Detection of starch in cloves, mustard, and cayenne 59 

Detection of colors 59 

Vinegar 60 



SOME FORMS OF FOOD ADULTERATION AND SIMPLE METHODS 
FOR THEIR DETECTION. 



GENEBAL DISCUSSION. 
PUBLIC OPINION. 

Since the middle of the last century the subject of food adultera- 
tion has attracted a constantly increasing amount of attention. In 
this country very little was done in this line until about 1880. In 18>>1 
the Division of Chemistry began the study of food adulteration, and 
since then has given a great deal of time to the subject. Since 1898 
the origin and place of manufacture of the foods studied by the Bureau 
have been carefully noted, and special attention has been given to 
imported foods. 

In 1883 the first practicable food-inspection law in the United States 
was enacted in Massachusetts. Since that time other States have 
enacted and enforced food laws until at the time of this writing (1906) 
twenty-live States are seriously attempting to regulate the character 
and quality of the foods sold in their markets. In three additional 
States laws relating to the purity of dairy products are enforced, and 
in several others a beginning has been made. 

Food legislation has received much attention abroad and the more 
highly civilized foreign countries have efficient food laws and enforce 
them rigidly. The subject of the purity of foods is more widely 
studied in the United States now than at any previous time. The 
people as a whole are better informed on the subject than ever before. 
and there is a constantly increasing demand for definite information. 
In response to a very large number of inquiries regarding the matter 
this bulletin has been prepared as a popular statement regarding the 
nature and extent of food adulteration, and includes simple tests by 
which the housekeeper or retail dealer may determine some of the more 
prevalent forms of adulteration practiced. 

The demand for information on this subject is now very general and. 
as is often the case when public interest is deeply aroused, there is an 
unfortunate tendency toward exaggeration which frequently amounts 
to sensationalism. Such an attitude is to be deplored, and unless it is 
checked must sooner or later react unfavorably. It is not unusual to 
speak of some of our typical foods as poisoned, and of food manufac- 
turers as poisoners. Such characterizations are unfortunate ;md 
4448°— No. 100—11 2 7 



8 FOOD ADULTERATION AND METHODS FOR DETECTION. 

untrue. Deleterious substances are doubtless sometimes added to 
foods. At the same time the word "poison" has a very strong and 
distinct significance and should not be applied to any of the substances 
ordinarily added to foods, except in the sense that they are harmful. 
The word " poisoner" signifies a person who intentionally and delib- 
erately administers an article intended to result fatally, or at least very 
disastrously to health. 

We do not for a moment admit that any manufacturer of foods adds 
to his products substances which he believes will be injurious to health. 
There is no reason for attributing such motives to so large and impor- 
tant a class of our citizens, and their business sagacity in other directions 
precludes the possibility of shortsightedness of so serious a nature. 
We can not do less than assume that manufacturers who depend for 
their success upon the reputation of their brands will add nothing 
which they believe will make their products seriously detrimental to 
health. It is not to their interest to shorten the lives of their customers 
nor to impair their appetites. We must assume that they honestly 
believe the products they employ to be wholesome. Therefore, in 
judging of the wholesomeness of preservatives and other substances 
added in the preparation of foods, the subject must be treated in a con- 
servative manner and no criminal or even dishonest motives attributed 
to those who differ with us on the subject. 

"ADULTERATION" DEFINED. 

During recent years there has been a tendency to confuse the minds 
of many by an incorrect use of certain words frequently used in the 
discussion of foods. It is the policy of some manufacturers to limit 
the woid ••adulterated" to foods to which have been added substances 
of lower value than the foods themselves with the intention of increas- 
ing the weight or volume. This limitation is certainly not justified by 
the English language nor by the facts, and such a restriction of the 
term is entirely unwarranted. The word "adulterated" properly 
describes a food to' which any noncondimental foreign substance, not 
properly constituting a portion of the food, has been added. The fact 
that the added substance may be at times of a greater commercial value 
than the food itself has no bearing on the question. Conversely, the 
word "pure" is properly applicable to foods that are unmixed with 
any foreign substance. It may be wholesome or unwholesome, but 
this property is not indicated by the word " pure" or " adulterated." 
This definition is not, of course, complete. According to the laws of 
many of the States a food is declared to be adulterated under the fol- 
lowing conditions: 

First, if any substance or substances have been mixed with it, so as to lower or 
depreciate or injuriously affect its quality, strength, or purity; second, if any infe- 
rior or cheaper substance or substances have been substituted wholly or in part for 



ADULTEKATIOIST DEFINED. V 

it; third, if any valuable or necessary constituent or ingredient has been wholly or 
in part abstracted from it; fourth, if it is an imitation of or is sold under the name 
of another article; fifth, if it consists wholly or in part of a diseased, decomposed, 
putrid, infected, tainted, or rotten animal or vegetable substance or article, whether 
manufactured or not, or, in the case of milk, if it is the product of a diseased animal; 
sixth, if it is colored, coated, polished, or powdered, whereby damage or inferiority 
is concealed, or if by any means it is made to appear better or of greater value than 
it really is; seventh, if it contains any added substance or ingredient which is poison- 
ous or injurious to health : Provided, That the provisions of this act shall not apply 
to mixtures or compounds recognized as ordinary articles or ingredients of articles 
of food, if each and every package sold or offered for sale bear the name and address 
of the manufacturer and be distinctly labeled under its own distinctive name and in 
a manner so as to plainly and correctly show that it is a mixture or compound, and 
is not in violation with definitions fourth and seventh of this section. 

The claim is made by some manufacturers that the addition of a 
preservative to food does not proper!}- constitute adulteration because 
the preservatives added are of greater commercial value than the foods 
themselves. Such a claim, however, seems to be nothing bat a play 
upon words. For instance, benzoate of soda has a greater commercial 
value, weight for weight, than tomatoes, and the claim has been made 
that for that reason its addition to tomatoes actually increases the 
expense of the preparation of tomato catsup. As a matter of fact, 
however, it permits the tomato pulp to be prepared in large quantities 
and preserved in barrels in a much less expensive way than can be 
done without its use. It is evident, therefore, that even though the 
preservative employed is more expensive than the substance to 
which it is added, the addition is really made for the purpose of cheap- 
ening the product. It is not for this reason that such a substance is 
properly called an adulterant, however, but because it is an added 
foreign substance and is neither a food nor a condiment. These defi- 
nitions can not be emphasized too strongly. Adulterated foods are 
not necessarily unwholesome foods. H 

The term "misbranded" is appropriate!}- applied to foods incor- 
rectly described by the label. The word has not the same significance 
as "adulterated," and yet the two terms may frequently be applied to 
the same product. For instance, commercial starch is sometimes added 
to sausage to increase its weight and permit of the use of a larger 
amount of water or of fatter meat than could otherwise be used. Such 
a product may properly be deemed adulterated, and at the same time, 
if the article were properly branded, it might not be open to objection 
either on the score of unwholesomeness or adulteration. If such an 
article, however, be sold simply as sausage, the purchaser must natu- 
rally assume that no substance has been added to increase the weight 
of the material without a corresponding increase of nutritive value. 
The addition of starch to sausage, therefore, is not in itself deleterious 
to health, but in the absence of a proper declaration is a fraud, because 
it cheapens the article which the customer supposes he is buying. In 



10 FOOD ADULTERATION AND METHODS FOR DETECTION. 

this connection, however, attention should be called to the claim of 
packers that 1 or 2 per cent of starch should be added to the sausage 
that is to be boiled, in order to prevent its shrinking when the sausage 
is cooked. 

The following definitions of ''adulteration* 1 and "misbranding," as 
applied to foods, are taken from the food bill now pending in Con- 
gress: 

Stae. >'>. That for the purposes of this act an article shall be deemed to be adul- 
terated — 

In the case of food: 

First. If any substance has been mixed and packed with it so as to reduce or 
lower or injuriously affect its quality or strength. 

Second. If any substance has been substituted wholly or in part for the article. 

Third. If any valuable constituent of the article has been wholly or in part 
abstracted. 

(fourth, if it he mixed, colored, powdered, coated, or stained in a manner whereby 
damage or inferiority is concealed. 

Fifth. If it contain any added poisonous or other added deleterious ingredient 
which may render such article injurious to health: Provided, That when in the 
preparation of food products for shipment they are preserved by an external appli- 
cation applied in such manner that the preservative is necessarily removed mechan- 
ically, or by maceration in water, or otherwise, the provisions of this act shall be 
construed as applying only when said products are ready for consumption. 

Sixlh. If it consist in whole or in part of a filthy, decomposed, or putrid animal 
or vegetable substance, or any portion of an animal unfit for food, whether manu- 
factured or not, or if it is a product of a diseased animal, or one that has died other- 
wise than by slaughter. 

Ski. 7. That tin- term ••misbranded." as used herein, shall apply to all drugs, or 
articles of food, or articles which enter into the composition of food, the package or 
label <>f which shad bear any statement regarding the ingredients or substances con- 
tained in such article, winch statement shall be false or misleading in any particular, 
and to any food or drug product which is falsely branded as to the State, Territory, 
or country in which it is manufactured or produced. 

That for the purposes of this act an article shall also be deemed to be misbranded: 

In the case of food — 

First. If it be an imitation of or offered for sale under the distinctive name of 
another article. 

Second. If it be labeled or branded so as to deceive or mislead the purchaser, or 
purport to be a foreign product when not so. 

Third. If in package form, the quantity of the contents of the package be not 
plainly and correctly stated in terms of weight or measure, on the outside of the 
package. 

Fourth. If the package containing it or its label shall bear any statement, design, 
or device regarding the ingredients or the substances contained therein, which state- 
ment, design, or device shall be false or misleading in any particular: Provided, That 
an article of food which does not contain any added poisonous or deleterious ingre- 
dient shall not be deemed to be adulterated or misbranded in the following cases: 

First. In the case of mixtures or compounds which may be now or from time to 
time hereafter known as articles of food, under their own distinctive names, and not 
an imitation or offered for sale under the distinctive name of another article, if the 

a House of Representatives, Fifty-ninth Congress, Report No. 2118, March 7, 1906. 



CHEMICAL PRESERVATIVES. 11 

name be accompanied on the same label or brand with a statement of the place where 
said article has been manufactured or produced. 

Second. In the case of articles labeled, branded, or tagged so as to plainly indicate 
that they are compounds, imitations, or blends: Provided, That the term blend as 
used herein shall be construed to mean a mixture of like substances, not excluding 
harmless coloring or flavoring ingredien^: And provided farther, That nothing in this 
act shall be construed as requiring or compelling proprietors or manufacturers of pro- 
prietary foods which contain no unwholesome added ingredient to disclose their trade 
formulas, except in so far as the provisions of this act may require to secure freedom 
from adulteration or misbranding. 

CHEMICAL PRESERVATIVES. 

During- recent years the practice has sprung up of adding to many 
articles of foods certain chemical substances which have the property 
of delaying or preventing fermentation and decay. These substances 
are commonly known as chemical preservatives. Among them are 
salicylic, benzoic, and boric acids, and their sodium salts (sodium 
salicylate, sodium benzoate. and borax), formaldehyde, ammonium 
fluorid, sulphurous acid, and sulphites. 

It is claimed by those who favor the use of chemical preservatives that 
the action of the latter is similar to that of salt, vinegar, and wood smoke, 
and that the use of the former is not open to greater objection than that 
of the latter.- In fact, there are not wanting some who claim that the 
former are less objectionable than the latter. The literature regard- 
ing the wholesomeness of the so-called chemical preservatives is not by 
any means uniform in either approving or disapproving them. It is 
the opinion of this Bureau that they can not be regarded as entirely 
wholesome even in the small amounts generally added to foods. The 
recent investigations conducted by this Bureau, in which twelve men 
were used as subjects, demonstrated that boric acid is injurious to 
health." The experiments of the German Imperial Board of Health 
had the same result, and Germany has prohibited the use of this pre- 
servative altogether. It is almost universally conceded that formalde- 
hyde and fluorids are injurious, and the weight of evidence is decidedly 
adverse to sulphurous acid as a preservative of meat products. The 
experiments of the Bureau of Chemistry indicate that neither salicylic 
acid nor benzoic acid is free from injurious effect-. 

There are now upon the market a large number of brands of com- 
mercial preservatives, and there are firms who make a specialty of 
preparing such preservatives. These substances are usually composed 
of the chemicals mentioned above. They are frequently sold with the 
statement that they comply with all pure-food laws, that they are 
entirely wholesome, and the claim is sometimes made that they are 
new T products, and that their presence in foods can not he detected by 

«l'. S. Dept. Agr., Bureau of Chemistry, Circular No. 15 (digest) and Bui. N -4. 
Parti. 



12 FOOD ADULTEKATION AND METHODS FOE DETECTION. 

the chemist. These statements are all untrue. As stated above, com- 
mercial preservatives usually consist of common substances of well- 
known antiseptic action. Their use is forbidden in many States, and 
their detection is not a difficult matter. 

As a result of these claims many su&all manufacturers are led unwit- 
tingly to violate the food laws of the various States. By using com- 
mercial preservatives which they are led to believe are not objectionable 
they add substances to their foods which they would not knowingly 
employ. Such instances have repeatedly occurred, and a number of 
preparations of similar nature are also put up in small packages and 
sold by agents from house to house for the preparation of what is 
known as ' ' cold process " preserves. These preparations are sold under 
the claims mentioned above, and many housekeepers have been led to 
use them who would not have employed them had they known their 
true character. Unfortunately, they are sometimes accompanied by 
directions for the preparation of fruits without any heat whatever, 
ami in such cases the amount of preservatives enrpWed is often far 
in excess of that which even the advocates of food preservatives 
advise. 

COLORING MATTER. 

Some difference of opinion has arisen among hygienisis regarding 
the wholesomeness of the substances frequently employed for coloring 
foods. European count lies have legally recognized the wholesome- 
oess <>f a considerable number of coal-tar derivatives. In this country 
a preference is frequently given by the State laws to vegetable colors, 
although coal-tar derivatives are more common^ employed. 

As far as their application to the preparation of foods is concerned, 
coal-tar colors have been found to be much more satisfactory from a 
technical standpoint than the pure vegetable colors. They are readily 
soluble, are cheap in consideration of the amount employed, and with- 
stand the action of light and time much better than the ordinary 
vegetable colors available for coloring food. 

In addition to any influence on digestion and health which the coal- 
tar colors may have, a certain amount of arsenic is added to them by 
some methods of preparation. In some colors, however, prepared 
with a special view to use in foods, arsenic is practically or entirely 
absent. In this connection it must be borne in mind that the amount 
of coloring matter necessary to give a food the desired tint is very 
small, and the danger to health resulting from its use should not be 
exaggerated. The question of fraud, however, remains, and the use of 
colors enables the manufacturer to give inferior products the appear- 
ance of high-priced goods. Yet again the colors may be used merely 
to produce an appearance more attractive to the eye and in accordance 
with popular taste, even though the best materials were employed. 
Thus, coloring matter maj 7 be added to foods for any of the following 



COLORING MATTER. 13 

reasons: It is sometimes placed in jelly and similar preparations when 
made only from the more expensive fruits and sugar, to make the 
color more permanent and enable the product to retain its appearance 
for a longer time upon the shelves of the grocer. If a considerable 
portion of the fruit has been replaced by means of apple juice and 
glucose, the coloring matter is added to simulate the appearance of the 
fruit that is supposed to be present. In the cheapest grade of jellies, 
which are made entirely from apple and glucose, and flavored artifi- 
cially to imitate the product of higher priced fruit, coloring matter is 
employed to represent the appearance of the product imitated. 

In the preparation of tomato catsup the natural coloring matter of 
the tomato is largel}" destroyed. This destruction is not so complete 
if the product is promptly made as when the pulp is stored for a con- 
siderable time before it is used, long storage of the pulp bleaching it 
to some extent. The addition of a little coloring matter, therefore, 
has been resorted to for the purpose of imitating the color of the 
product which is made promptly and by the most careful methods. 
The addition of color, however, is likely to be abused, and this tendency 
has resulted in placing upon our market tomato catsup of a deep-red 
color, much more vivid than could possibly be obtained without the 
use of artificial colors. 

In the preparation of cucumber pickles the natural green of the 
cucumber is somewhat impaired. Some manufacturers have employed 
copper compounds for the purpose of imparting to the product a 
greenish tint. This also has been carried to excess, and we sometimes 
find upon our market pickles of a bright green hue which is not sug- 
gestive of anj' natural food. The same practice obtains in the prepara- 
tion of canned peas and beans. The great majority of those products 
imported from Europe are colored with copper, and as a result are of 
a much brighter color than the same vegetables cooked when gathered 
freshly from the garden. 

In the manufacture of butter it is found that the color varies with 
the season of the year, the feed of the cow from which the milk is 
obtained, and within certain limits with the breed of the cow. This 
results in a variation in the color of butter which manufacturers have 
attempted to correct b}^ adding a sufficient amount of coloring matter 
to make the color uniform. This practice has also been carried to 
excess, and the butter now on our market is colored more deeply than 
is natural. This color varies in different markets of the country. For- 
tunately, during recent years, there has been a tendenc} 7 to decrease 
the color of the butter, and it is to be hoped that before many years 
people will demand a product which is prepared without any addition 
of color whatever. 

Coloring matter is sometimes employed for the purpose of simulat- 
ing the appearance of a more perfect article than that actually used. 



14 FOOD ADULTERATION AND METHODS FOR DETECTION. 

For instance, in the preparation of canned tomatoes a product having 
a certain brightness of color may be obtained if the tomatoes are per- 
fect, fully ripe, and of certain varieties. Often, however, the toma- 
toes delivered to the canner do not yield a product of the desired color. 
For this reason some cancers make a practice of adding coloring 
matter to their product, thus giving it an appearance which they say 
is more acceptable to their customers. 

Again, in the case of meat the color disappears after considerable 
time, the meat losing its bright, fresh color before the process of decay 
is evident. Therefore, the coloring matter is not usually applied to 
fresh meat held at low temperature, but to chopped meat, Hamburg 
steak, and sausage, the addition of coloring matter to this product thus 
giving it the fictitious appearance of fresh meat. 

FORMS OF ADULTERATION OF SPECIFIC FOODS. 

In the following pages are given under each class of foods treated 
the results of the examination of foods in a number of laboratories in 
the United States. These tables give usually the number of samples 
of each product examined in the various laboratories and the number 
found not to comply with the laws of the States in which they were 
examined. The figures given in these tables, however, must not be 
understood to represent the percentage of the various classes of foods 
in the United States that are adulterated, but. rather the kinds of adul- 
teration practiced and in a general way whether such forms of adulter- 
ation are more or less frequent. 

The samples submitted to analysis were not usually representative 
samples. The inspectors in the various States are trained men, and are 
always instructed to select especially those samples which they have 
reason to believe are likely to be adulterated. Brands of foods which 
they know from previous experience are pure are, therefore, not com- 
monly taken by these inspectors, and products whose purity for any 
reason they are inclined to suspect are sampled. In the report of each 
laboratory, therefore, the percentage of adulterated samples is stated, 
not in terms of the average foods of the State, but in terms of the foods 
which experienced inspectors have regarded with suspicion. 

BAKING POWDERS AND BAKING CHEMICALS. 

Baking powders consist of a mixture of bicarbonate of soda with 
some acid ingredient. When the powders are moistened, these two 
substances unite and liberate carbon dioxid gas. To prevent the two 
substances mentioned above uniting prematurely while the baking 
powder is still in the package, owing to moisture in the atmosphere, 
starch is usually employed as a filler. Some brands are claimed by 
the manufacturers to contain no filler, but to consist exclusively of 
sodium bicarbonate and the acid ingredient employed. 



ADULTERATION" OF BEVERAGES. 15 

Three substances are used as the acid ingredient of baking powder — 
cream of tartar, alum (basic aluminum sulphate), and acid phosphate. 
In some powders a mixture of alum and acid phosphate is employed. 
Sometimes the amount of filler employed is excessive, and sometimes 
foreign mineral matter is present. .Perhaps the most objectionable 
form of adulteration of baking powder that has occurred in recent 
years was the use of a considerable percentage of ground soapstone. 
The particles of stone were sharp-cornered and decidedly inappropriate 
for use in the preparation of foods. 

The cream of tartar on the market is frequently adulterated with 
other acid substances, such as alum and acid calcium phosphate. These 
materials are of a more acid nature than cream of tartar, and permit 
of the addition of a considerable percentage of inert material which is 
often employed. 

Table I. — Cream of tartar. 



Extent of adulteration. 



No. samples y °J^ es 
examined. *™£ r 



Alum, calcium sulphate, acid calcium ! Frequent. I Senate Rept. 516, p. 117, 56th Congress, 



phosphate, and starch 
Do 



Do 

Terra alba, acid calcium phosphate. 



2d session. 
4 Senate Rept. 516, p. 584, 56th Congress, 
2d session. 
76 24 Rept. Conn. Agr. Expt. Sta., 1900. 

Frequent. Senate Rept. 516. p. 529, 56th Congress, 

2d session. 

Acid phosphate of lime, cornstarch, 43 9 Rept. Conn. Agr. Expt. Sta., Pt. 2, 1901. 

sulphate of lime, alum, etc. 

Do 91 19 • Rept, Conn. Agr. Expt. Sta., Pt. 2, 1904. 

Do ■ 343 5 Rept. Mass. State Bd. Health. 1901. 

Do i 326 20 Rept. Mass. State Bd. Health, 1902. 

Do | 317 5 Rept. Mass. State Bd. Health, 1903. 

Do ' 4 4 Rept. Mich. Dairy and Food Comm., 



Do 

Do 

No cream of tartar present 



1901. 
11 7 Rept. Mich. Dairy and Food Comm., 

1904. 
20 6 Rept. Minn. Dairy and Food Comm., 

1903. 
5 2 Rept. N. D. Agr. Expt. Sta,, 1902. 



BEVERAGES. 

ALCOHOLIC. 

Wine is sometimes prepared artificially by the fermentation of glu- 
cose with the addition of raisins, or some fruit juice, and artificially 
colored. Such products, however, are probably not sold as a beverage 
to any extent and do not form an important part of our commerce. 
The cheaper grades of wine are sometimes colored artificially and chem- 
ically preserved. 

Carbonated wines, prepared by means of dissolving in them carbon 
dioxid gas under pressure, are sometimes sold as champagne. On the 
whole, the fraudulent practice most frequently employed with wine 
is misbranding with regard to its variety and place of manufacture. 

Beer is frequently preserved chemically. In the case of whisky and 
brandy artificial products are often sold under labels which represent 

4448°— No. 100—11 3 



16 



FOOD ADULTERATION AND METHODS FOE DETECTION. 



them to be natural products. So-called essences are made on the man- 
ufacturing scale and sold commercially for the preparation of bever- 
ages intended to represent the various classes of distilled liquors. To 
these products a small amount of soap is sometimes added to produce 
a "bead". 

NONALCOHOLIC. 

Nonalcoholic beverages, such as ginger ale and the various fruit 
sirups, are frequently preserved with salicylic acid and benzoic acid 
and colored with coal-tar derivatives. These products may be detected 
as described on pages 43 to 46. Sirups for soda-water fountains are 
sometimes altogether artificial and are commonly preserved, colored, 
and often flavored artificially. 

Tahle II. — Nonalcoholic beverages. 
CARBONATED PRODUCTS. 





Extent of adulteration. 




Adulterant. 


No. samples 

examined. 


No. samples 
adulter- 
ated. 


Reference. 


Artificial flavors and colors ... 

Do 

Do 

Do 


! ! ; 69 

36 

... 


4;? 
26 

23 
24 


Rept, Conn. Agr. Expt. Sta., Pt. 3,1902. 
Rept. Kv. Agr. Expt. Sta.. 1902. 
Rept, N.' H. State Bd. Health, 1903-1. 
Bull. N. C. State Bd. Agr., 1903. 



SIRUPS AND FRUIT JUICES. 



Glucose 

Preservatives 

Artificial flavors 

Do 

Artificial flavors and colors" 

Do 

Preservatives (grape juice) , 

Do 

Preservatives (grape juice and 

cider). 
Preservatives (lime juice) 



120 


8 


120 


26 


120 


57 


3 


3 


113 


76 


27 


20 


6 


2 


13 


6 


3 


3 


5 


4 



Rept. Conn. Agr. Expt. Sta., 1899. 

Do. 

Do. 
Rept. ( )hio Dairy and Food Comm., ] 
Rept. Conn. Agr. Expt. Sta., Pt. 3, 1902. 

Do. 
Rept. Mass. State Bd. Health, 1902. 
Rept. Mass. State Bd. Health, 1903. 

Rept. Ky. Agr. Expt. Sta., 1900. 
Rept. Mass. State Bd. Health, 1902, 



MISCELLANEOUS, 



Salicylic acid (cider) 

Salicylic acid (ginger ale) 



Rept. Mass. State Bd. Health, 1903. 
Do. 



i Sirups from soda fountains. 



CANNED VEGETABLES. 

Canned vegetables constitute a class of products relatively free from 
adulteration bj T means of foreign substances. Imported canned peas 
are commonly colored with copper sulphate. Owing to the enforce- 
ment of the imported food law by the Bureau of Chemistry, the pres- 
ence of copper is now almost universally stated on the labels of these 
goods. Peas and beans grown and canned in America are rarely 
colored. 



ADULTEEATIOIST OF VEGETABLES. 



17 



One of the most frequent frauds in this class of products is the 
preparation of goods which have reached a relatively mature state, 
and the selling of such products as first grade. Mature peas, for 
instance, are sometimes soaked for the purpose of softening them, 
canned, and sold as peas of first quality. Again, peas that are not 
thorough^ ripe, but so nearlv mature as to be relatively hard and 
white, are sometimes canned as a high grade article. 

At the period at which sugar corn is canned the sugar disappears 
very rapidly- after picking and it is customary to add some sugar at 
the time of canning. During recent years many canning establish- 
ments replaced sugar with saccharin, an artificial sweetening material 
derived from coal tar. A few years ago it was customary to bleach 
corn for canning by means of sulphites, but this practice has been 
almost entirely discontinued. 

Tomatoes are sometimes colored artificially in order to add to the 
price of an inferior article. 

Table III. — Canned vegetables. 

ASPARAGUS. 





Extent of adulteration. 




Adulterant. 


No. samples x Sf 
examined. a ™f 


Reference. 




9 ' 7 




Bo 


13 11 Bu!l.l3,Pt.8,Div.Chem.,'u.S~. Dept.Agr., 
j 1893. 




BEANS (STRING AND LIMA). 



Copper (French origin) 

Copper (American origin) . 

Copper 

Do 

Preservatives 

Saccharin 

Preservatives (French) 



Preservatives (American) . 

Do 

Preservatives 



20 

Occasional. 

do. 

Rare. 

Frequent. 

7 



Bull. 13, Pt. 8, DiT. Chem., U. S. Dept. Agr. : 
Do. 

Rept. N. D. Agr. Expt. Sta., 1905. 

Do. 

Do. 
Bull. 13, Pt. S, Div. Chem., U. S. Dept. Agr., 
1893. 

Do. 
N.C Food Rept., 1900. 
Bull. 13, Pt. 8, Div. Chem., U. S. Dept. Agr., 

1893. 
N.C. Food Rept., 1900. 



Preservatives. 



Do.... 
Do.... 

Sulphites . 
Do.... 



Do.... 

Saccharin 

Do.... 

Do.... 

Sulphites. 



41 




24 


6 




3 


70 




32 


6 




2 


41 




12 


70 




11 


Frequent. 




70 | 


2 


Frequent. 




Occas 


ional. 





Bull. 13, Pt. 8, Div. Chem., U. S. Dept.Agr. 

Bull. 165, N. C Expt. Sta., 1899. 

N.C. Food Rept., 1900. 

Bull. 165, N. C. Expt. Sta., 1899. 

Bull. 13, Pt. 8, Div. Chem., U. S. Dept. Agr. 

1893. 
N.C. Food Rept., 1900. 

N. C. Food Rept., 1900. 
Kept. X. 0. A«r. Expt. Sta., 1905. 
Do. 



"Contained small amount of copper. 



18 FOOD ADULTERATION AND METHODS FOR DETECTION. 

Table III.— Canned vegetables— Continued. 
MUSHROOMS. 



Extent of adulteration. 

No. samples ^^ 
, examined. *"" / 



Sulphites 

Copper sulphate and snaked goods. 
Copper i French goods) 

Copper 

( topper i American good^ 

Copper 

Preservative! 

Do 

Aluminum salts 



Saccharin 

Nol specified 

Do 

Do 

Preservatives 

Salicylic acid 

fied 



Frequent. 



Rept. X. D. Agr. Expt. Sta.. 1905. 



11 
43 

Frequent. 

81 

36 
Occasional. 

do. 
Rare. 



2 Rept. Mass. State Bd. Health, 1903. 
35 Bull. 13, Pt. 8, Div. Chem., U. S. Dept. Agr., 

86 Rept.X.Y. Dairy Comm., l>9o. 
S Repts. Ohio Dairy and Food Comm., 

1895-99. 
29 Bull. 13. Pt. s. Div. Chem. .1". S. Dept. Agr.. 
1893. 
Rept. X. D. Agr. Expt. Sta., 1905. 
15 Bull. 13, Pt. 8, Div. Chem., U. S. Dept. Agr.. 

1898. 
29 N. C. Feed Rept., 1900. 

Rept. N. D. Agr. Expt. Sta., 1905. 
do. 
do. 
5 Rept. Ohio Dairy and Food Comm., 1901. 
2 Rept. Ohio Dairv and Food Comm.. 1902. 
5 Rept. Ohio Dairv and Food Comm.. 1903. 




36 N. C. State Bd. Agr.. 1900. 

Bull. 13, Pt.8, Div. Chem.. V. S. Dept. Agr., 

Rept. Ohio Dairy and Food Comm., 1903. 



CEREAL PRODUCTS. 

BREAKFAST FOODS. 

During the last few years the number of breakfast foods on the 
market lias been enormously increased, and very many of them are 
extensively advertised by means of greatly exaggerated statements 
regarding their nutritive value. Some of these products are simply 
ground with no other preparation than the removal of the hulls, etc. 
Otler- are partially eooked. and still others are " pfedigested " by 
means of special treatment. 

There appears to be some doubt as to the amount of advantage 
derived from the treatment to which the partially cooked and pre- 
digested foods are subjected. All breakfast foods when thoroughly 
cooked seem to be equally as digestible as the products placed on the 
market in a more advanced state of preparation. 

The rumors which have been circulated from time to time that 
arsenic and other poisonous substances are used in breakfast foods 
have been entirely without ^foundation. There is no doubt of the 
wholesomeness of these foods. At the same time, the exaggerated 
claims made by the manufacturers regarding their superior nutritive 
qualities are to be deplored. 



ADULTERATION OF COCOA. 19 



There is an impression in some quarters, unfortunately, that flour 
is adulterated with ground gypsum or other mineral matter. It is 
also believed by many that alum is used for the purpose of whitening- 
bread. It may be said, however, that these forms of adulteration are 
not practiced in this country. 

Some years ago an effort was made to place on the market a ground 
stone for the purpose of adulterating flour. This product was exten- 
sively advertised by means of circular letters addressed to millers. As 
far as we have been able to ascertain, however, the product was never 
used. At one time during recent years the use of Indian corn flour 
for the adulteration of wheat flour became somewhat prevalent. This 
practice was entirely stopped by the enforcement of the Federal law 
relating to mixed flour. At the present time there is probably no 
product on our market more free from adulteration than wheat flour. 

Some adulteration is practiced in special kinds of flour. For 
instance, much of the so-called gluten flour on the market is not at all 
what it purports to be. Frequently untreated wheat flour is sold for 
gluten flour. Buckwheat flour and other special articles of that nature 
are also frequently adulterated with cheaper cereal products. 

Table IV. — Cereal products. 

| Extent of adulteration.! 



fe-s P^ao^T 



Coal-tar dyes and other colors 

(in vermicelli). 
Turmeric, foreign colors, etc. 
(in noodle- |. 

Do 

Not specified (in cereals) 

Wheat flour (in buckwheat flour; 

Do 

Not specified (in flour 



22 


22 


20 


1 


2 ! 


1 


10 


3 


24 i 


2 


64 


2 



Rept. Conn. Agr. Expt. Sta., Pt. 2, 1901. 

Do. 

Rept. Conn. Agr. Expt. Sta., 1904. 
Rept. Ohio Dairy and Food Comm., 1992. 
Rept. Mich. Dairy and Food Comm., 1901. 
Rept. Ohio Dairy and Food Comm.. 1900. 
Rept. Ohio Dairy and Food Comm.. 1901. 



Do 64 2 Rept. Ohio Dairy and Food Comm., 1902. 

COCOA AND CHOCOLATE. 

In the preparation of cocoa and chocolate, cocoa beans are roasted, 
freed from shells, and ground. The resulting product is known as 
cocoa mass. It contains about 50 per cent of fat (cocoa butter), and is 
sometimes melted into cakes without any farther addition and sold as 
plain chocolate or bitter chocolate. 

For the preparation of sweetened chocolate, cane sugar j> added to 
the cocoa mass and ground at a temperature sufficient to melt the fat. 
Milk chocolate is prepared by mixing with the cocoa mass dry milk 
powder (obtained by the evaporation of whole milk) and sugar. 

Cocoa is obtained by pressing the cocoa mass while still sufficiently 
warm to melt the fat so that a portion of it is removed. The fat is 



20 



FOOD ADULTERATION AND METHODS FOR DETECTION. 



melted into cakes and sold as cocoa butter, while the pressed cakes of 
cocoa from which a portion of the fat has been extracted are ground 
up in the preparation of breakfast cocoa. 

For the purpose of cheapening cocoa and chocolate, starches of vari- 
ous kinds arc ground in with the cocoa mass at the time of the intro- 
duction of the sugar or with the cocoa after the expression of the fat. 
The list of the various starches that have been reported from different 
sources is given in Table V. It will be noted - that with a few excep- 
tions the adulterants reported in this class of products are not injurious 
to health except in so far as they reduce the nutritive value of the 
product. At the same time such products as iron oxid, sawdust, sand, 
and woody shells can not be regarded as wholesome and should not 
be added to foods. 

Table V. — Cocoa and chocolate. 





Extent of adulteration. 




Adulterate.] 


No. samples 

examined. 


So. samples 

adulter- 
ated. 


Reference. 




64 

92 
M 

82 

64 

- 

64 

64 

64 

Freq 

29 
is 
73 
45 
12 
39 


9 

1 

1 
14 

4 

1 
12 
1 
uent. 
o. 

6 
9 
34 
18 
- 
18 


Bull. 13, Pt. 7, Div. Chem., D. S. Dept. Agr., 


Do 


1892. 
Unpublished records, Bureau Chem. 
Bull. 13, Pt. 7. Div. Chem., U. S. Dept. AgT., 






1892. 

Unpublished reeords, Bureau Chem. 




Bull. 13, Pt. 7. Div. Chem., U. 8. Dept. Agr., 


I),, 


1892. 

1'npublished records, Bureau Chem. 
Bull. 13, Pt. 7, Div. Chem., 1892. 






Do. 




Do. 




Do. 


Do 


Unpublished records, Bureau Chem. 
Bull 13, Pt. 7, Div. Chem., 1892. 








Wheat flour and maize stareh 

no 


Kept. Ma-s. State Bd. Health. 190L 
Kept. Ma~s. State Bd. Health, 1902. 


Do 


Kept. Mas*. State Bd. Health, 1903. 


I)c, 


Rept. Mich. Dairvand Food C'omm.,1904. 




Fre<i 
33 
64 

45 


uent. 

12 

51 

14 
18 

19 


Kept. N. D. Agr. Expt. Sta., 1905. 

Kept. Ma«. State Bd. Health, 1900. 

Bull. 13, Pt. 7. Div. Chem., U. B. Dept. Agr., 






Do 


■ 2 


Wheat. Hour, maize starch & 

Bermuda arrowroot starch, wheat 
flour.c 


Kept. Conn. Agr. Expt. Sta., 1903. 
Kept. Conn. Agr. Expt. Sta., 191 2. 






'-In cho 



COFFEE AND TEA. 

Owing to the enforcement of the Federal tea law. by inspectors sta- 
tioned at all ports of entry, it is believed that no adulterated tea 
comes into this country, and it is probably true that the adulteration 
of this product i- not practiced after entry. Formerly it was believed 
thai many other leaves were used as substitutes or adulterants for tea, 
and a sample may be readily examined for such adulterants by thor- 
oughly wetting and unrolling the leaves and noting their shape. 

With regard to coffee, however, while it is believed that only the 



ADULTERATION OF SAUCES. 



21 



pure product is brought into the country, its adulteration after reach- 
ing our shores is not uncommon. The attempts that have been made 
to imitate the coffee bean have not been commercially successful, but 
the ground coffees sold in the market are frequently adulterated. For 
this purpose chicory was usually emplo} T ed, but has since been largely 
replaced by articles of lower value — ground peas, wheat, beans, barley, 
etc., now being commonly used. The principal offense in the coffee 
trade is misbranding as to country of origin. The sale of Brazilian 
coffee, for example, as Java or Mocha is unfortunately very common. 
The artificially molded coffee berries, referred to above, are not on 
the market, as far as is known, but may be readily distinguished by 
cutting a cross section of the bean and examining its structure. That 
of the artificial bean is of a compact, solid, uniform nature, whereas 
the true coffee has a characteristic structure that can not be imitated. 
If pure coffee is desired, therefore, the most practical plan is to buy 
it unground. 

Table VI.— Coffee: 





Extent of adulteration. 




Adulterant. 


No. samples 
examined. 


No. samples 
adulter- 
ated. 


Reference. 


Chicory, ground peas, wheat 
flour, etc. 
Do 


50 

33 
29 

28 

143 

125 

106 

3 

8 

5 

3 

74 

34 


5 

3 
9 
13 

10 
2 
6 
1 
4 
4 
2 

36 
31 


Kept. Conn. Agr.Expt, Sta., Pt. 2, 1901. 
Rept. Conn. Agr.Expt. Sta., Pt. 3, 1902. 


Do 


Rept. Conn. Agr. Expt. Sta., Pt. 2, 1903. 


Do 




Do 


Kept. Mass. State Bd. Health, 1901. 


Do 


Rept. Mass. State Bd. Health, 1902. 


Do 


Rept. Mass. State Bd. Health, 1903. 
Rept. Kv. As;r. Expt. Sta., 1900. 


Do 


Do 


Rept. Mich. Dairv and Food Comm., 1901. 
Bull. N. C. State Bd. Agr., 1902. 


Do 


Do 




Do 

Do 


Rept. Ohio Dairv and Food Comm., 1901. 
Rept. Ohio Dairy and Food Comm.. 1902. 



CONDIMENTAL SAUCES. 

The term " condimental sauces" as here used is intended to apply 
to catsups, pickles, and miscellaneous sauces. It is not intended to 
include vinegar or spices, which are considered under other captions 
(see pp. 33 and 40). 

Catsups are very commonly colored and preserved. In the home a 
single bottle of catsup may be kept open for a considerable time, and 
a demand has been found for preserved goods in order that the bottle 
may be kept without deterioration of the contents for some time after 
it is opened. Again, some manufacturers buy the greater part of the 
tomatoes used in making catsup within a very short period in the sum- 
mer. They then prepare the pulp and store it in barrels, preserved 
with benzoic or salicylic acid to prevent its spoiling. Owing to the 
demand for catsups free from preservatives, however, some firms are 
now preparing their goods in small bottles sterilized by beat. These 



22 



FOOD ADULTERATION AND METHODS FOR DETECTION. 



are found to keep perfectly well before opening, but of course must be 
ased within a reasonable time after they are opened, and be kept in a 
cool place. An additional expense attends the preparation of goods in 
this manner, as it is necessary to preserve the pulp by means of sterili- 
zation by heat until such time as it is desirable to prepare the catsup. 
Pickles art- -ometimes colored with copper, as in the case of imported 

peas and bean-. 

Table VII. — Condimental sauces. 

CATSUPS. 
Extent of adulteration. 



Adulterant 


No. samples 
examined. 


Xo. samples 
adulter- 
ated. 




36 
94 

66 
53 
2 
23 
36 
12 

a 

36 

.V, 
22 

Preq 

8 
Preq 

48 
12 
.56 
42 
12 
80 
42 
9 


lent. 
tent. 


; J ,.=> 


J'r natives and artificial color- 



Do 

Do 

I-. 

I),, 


79 

66 
BO 

2 

12 

:. 




If, 




SI 


Do 


M) 


Do 


h 




.,-. 


Do 




Coal tar dyes and preservatives. . . 


s 




43 




■". 




)<; 


Do 


:-::. 


In. 


1 


l'.. 


HI 


I'M 


9 



Rept. N. C. State Bd. Agr.. 1900. 
Rept.Conn. Agr. Expt. Sta., 1901. 

Kept. Conn. Agr. Expt. Sta., 19C4. 
Kept. Kv. Agr. Expt. Sta., 1902. 
Kept. Mass. State Bd. Health. 1902. 
Kept. Minn. Dairv and Food Comm 
Rept.X. H. State Bd. Health, 1903-4. 
Kept. Minn. Dairy and Food Comm. 
Rept. 111. DairvandFoodComm 
Kept. X. C. 8tate Bd. Agr., 1900. 
Bull. 86, Ky. Aer. Expt. Sta., 1900. 
Hull. X. estate Bd. Agr., 1903. 
Kept. X. D. Agr. Expt. Sta., 1905. 
Rept. X. L). Agr. Expt. Sta., 1902. 
Rept.N.D. Agr. Expt. Sta., 1905. 
II!. Dairy and Food Kept., 1899-1900 
Kept. Minn. Dairv and Food Comm. 
Bull. 86, Ky. Agr. Expt. Sta., 1900. 
Rept. Conn. Agr. Expt. Sta.. lv<7. 
Kept. Ohio Dairy and Food Comm.. 
Rept. Ohio Dairy and Food Comm.. 
Rept. Ohio Dairy and Food Comm., 
Kept. Ohio Dairy and Food Comm., 



,1900. 



CHILI SAUCE. 


ves and artificial colors. 



•1 

15 15 


Kept. Conn. Agr. Expt. Sta.. 1901. 
Kept. conn. Agr. Expt. Sta., 1904. 


PICKLES. 


Preservatives, glucose, copper salts. 

Do 

Xot specified 


21 
5 
1 


20 
5 
1 


Rept. Conn. AgT. Expt. Sta., 1902. 
Rept. Mass. State Bd. Health. 1901. 
Rept. Ohio Dairy and Food Comm., 1903. 




MIS'CELLAXEOT 


S. 




3 2 


Rept. Conn. Agr. Expt. Sta.. 1901. 
Kept. Ky. Agr. Expt. Sta., 1900. 


Preservatives (in catsu] 


•~>7 


45 



DAIRY PRODUCTS. 
BUTTER. 



The sale of oleomargarin as butter was formerly very common, but 
the enforcement of the internal-revenue laws, relative to that subject, 
by the Treasury Department, and of the State laws/' have greatly less- 



ee S. Dept. of Agr., Bureau of Chemistry, Bui. 
and Food Control. 



Revised, Parts I- VIII, Foods 



ADULTERATION OF DAIRY PRODUCTS. 23 

ened this species of fraud, although, as will be seen on consulting 
the table on page 25, violations of these laws still occur with consid- 
erable frequency. 

It is now the custom to treat much of the rancid butter on the mar- 
ket in such a way as to remove the rancidity in the preparation of 
what is known as ' ' process " or ' ' renovated butter. " In the early days 
of the manufacture of this article it was ordinarily sold as fresh butter. 
At the present time, however, this product is required to be marked 
on the wrapper with the words " Renovated Butter," and violations 
of the law requiring this are relatively infrequent. This law is 
enforced b}^ the Bureau of Animal Industry of the Department of 
Agriculture in collaboration with the Treasury Departments The 
chemical analyses necessary in the enforcement of the law are made 
in the Bureau of Chemistry. 

Butter is sometimes preserved with boric acid, and glucose has 
sometimes been found as an adulterant. The coloring of butter is 
usual, and is permitted by the laws of all the States. The principles 
governing the legislation regarding coloring matter of foods in gen- 
eral have not been ordinarily applied to the coloring of butter. The 
present tendency, however, seems to be to prepare butter with a 
lighter tint, and a more natural-looking article can now be found in 
the market than formerty. 

CHEESE. 

One of the most frequent methods of adulterating cheese is to pre- 
pare it from milk which has been skimmed and to which some other 
form of fat has been added for the purpose of replacing the fat of 
the cream removed. Both lard and cotton-seed oil have been used 
for this purpose. Cheese which has such an addition of foreign fat 
is known as " filled cheese." Such a product well illustrates a form 
of adulteration which, although it may not be at all unwholesome, is 
fraudulent, and if sold as full cream cheese constitutes a form of 
misbranding. Such a sale is unfair to the buyer, aside from the ques- 
tion of price. If the cheese is desired for melting, as in making a 
Welsh rarebit, or for other use in cooking-, the foreign fat or oil of 
the filled cheese will separate much more readily than from a genuine 
cheese, leaving a gummy mass, instead of melting smoothly as a full 
cream cheese will do. 

CREAM. 

Cream is frequently preserved artificially. This is illegal in most 
of the States, but some which prohibit artificial preservatives in milk 
permit them in cream. How this position is justified does not appear. 
During recent years preparations known as "thickeners" have been 
sold to permit dealers to sophisticate their wares. These thickeners 

«U. S. Dept. of Agr., Bureau of Chemistry, Bui. 69 Revised, Part I. p. 28 

444S°— >:o. 100—11 4 



24 FOOD ADULTERATION AND METHODS FOR DETECTION. 

ordinarily consist of gelatin, and sometimes contain boric acid for the 
purpose of preserving the cream. 

Since in the use of cream the dietetic value of fat is taken into con- 
sideration, and especially since it is frequently employed in the 
preparation of modified milk for the use of infants, the sale of a 
product in which the fat has been largely replaced by gelatin should 
be condemned in strong terms. 



The most serious problem connected with food control is the regu- 
lation of the milk supply. A considerable portion of the milk con- 
sumed is employed as food for infants and invalids. In such cases it 
frequently fords the entire food consumed by an individual. For 
that reason, and because of the susceptibility of infants and invalids 
to interfering substances, it is imperative that the qualit} T of the milk 
supply be carefully guarded. 

The addition of preservatives to milk is particularly to be condemned, 
partly because of the influences of the preservative itself on the health 
of infants and invalids by whom the milk may be used as a food, and 
partly because of the less cleanly methods that may be employed in 
the preservation of milk when preservatives are used, and of the 
increased danger in the consumption of such milk. 

The most common adulteration practiced with milk is the addition 
of water or the removal of cream. The management of the dairy and 
the care of the milk from the time it is received from the cow until it 
is delivered to the consumer are attended b}- great difficulties. If the 
milk is to be kept without chemical preservation, absolute cleanliness 
and prompt, intelligent care are imperative. This is true at all times 
and especially in the summer. The milk must be cooled immediately and 
kept cool until its delivery to the consumer, and then delivery must 
not be delayed too long. Even after the milk is left at the door of the 
consumer considerable annoyance is caused by many who do not take 
their milk promptly and place it in the refrigerator. It is frequently 
allowed to stand at the door for a considerable time, and then many 
cases of spoiling for which the consumer is responsible are attributed 
by him to the daily men. 

In order to avoid these inconveniences the use of preservatives with 
milk is frequently practiced wherever the enforcement of the food 
laws is not rigid. In this connection especial^ the use of commercial 
preservatives represented to be in conformity with the food laws is of 
interest (see p. 11). 



ADULTERATION OF DAIRY PRODUCTS. 



25 



Table YIII. — Dairy products. 
BUTTER. 



Extent of adulteration. 



examined.; ^ulter- 



Oleomargarin 67 44 

Do 173 75 

Do 171 167 

Do 342 139 

Do Frequent. 

Do do. 

Do do. 

Do 50 

Do 81 56 

Do Frequent. 

Do do. 

Do 177 11 

Do 68 44 

Do 97 50 

Do 1.777 1,033 

Do 227 9 

Process butter Frequent. 

Do do. 

Do do. 

Do do. 

Do do. 

Oleomargarin or renovated butter. 35 18 

Do 41 14 

Do 147 29 

Do 116 7 

Do 165 41 

Do 142 17 

Do 5 3 

Do 4 2 

Do 406 : 268 

Do 209 ! 155 

Do 2 1 

Borax 342 47 

Water and foreign fats 121 5 

Not specified 77 38 

Do 45 14 

Do 43 24 

Do . 17 10 



Rept. Ohio Dairy and Food Coram., 1899. 

Rept. Mich. Dairy and Food Comm., 1900. 

Rept. N. J. Dairy and Food Comm., 1895. 

Rept. Minn. Dairy and Food Coram., 1901. 

Senate Report 516, 1900. 

Rept. Conn. Agr. Expt. Sta., 1897. 

Rept. N. C. State Bd. of Agr., 1900. 

Rept. Conn. Agr. Expt. Sta., 1899. 

Rept. Ohio Dairy and Food Comm., 1898. 

Rept. Wis. Dairy and Food Comm., 1895-6- 

Rept. 111. Food Comm., 1899-1900. 

Rept. Mass. State Bd. of Health, 1900. 
, N.J. Food Rept., 1888. 
. Rept. Ohio Dairy and Food Comm., 1888. 
j Rept. Pa. Dept. of Agr., 1900. 

Rept. Mass. State Bd. of Health, 1899. 

Rept. Ohio Dairy and Food Comm., 1899. 

Rept. Mich. Dairy and Food Comm., 1900. 

Rept. Minn. Dairy end Food Comm., 1901. 

Rept. 111. Food Comm., 1901. 

Rept. Pa. Dept. of Agr., 1900. 

Rept. Conn. Agr. Expt. Sta., Pt. 2, 1901. 

Rept. Conn. Agr. Expt. Sta., Pt. 3, 1902. 

Rept. Kv. Agr. Expt. Sta., 1900. 
i Rept. Mass. State Bd. of Health, 1901. 
: Rept. Mass. State Bd. cf Health, 1902. 

Rept. Mass. State Bd. of Health, 1903. 
i Rept. Mich. Dairy and Food Comm., 1901. 

Rept. Mich. Dairy and Food Comm., 1904. 

Rept. Minn. Dairy and Food Comm., 1901. 

Rept. Minn. Dairy and Food Comm., 1903. 

Rept. N. H. State Bd. of Health, 1903-4. 

Rept. Minn. Dairv and Food Comm., 1900. 

Rept. Ky. Agr. Expt. Sta., 1902. 

Rept. Ohio Dairy and Food Comm., 1900. 

Rept. Ohio Dairy and Food Comm., 1901. 

Rept. Ohio Dairy and Food Comm.j 1902. 

Rept. Ohio Dairv and Food Comm., 1903. 



Extraction of fat 

Do 

Do 

Cotton-seed oil 

Do 

Do 

Do 

Low in fat content 

Do 

Do 

Preservatives 

Do 

Preservatives and skimmed milk 
Not specified 




Rept. Ohio Dairy and Food Comm., 1890. 
Rept. Wis. Dairv and Food Comm., 1895. 
Rept. Minn. Dairy and F>od Comm., 1900. 
Rept. Ohio Dairy and Food Comm.. 1896. 
Rept. Wis. Dairy and Food Comi 
Rept. Minn. Dairv and Food Comm.. UKO. 
Bull. 13, Pt. 1, U. S. Dept. Agr.. 1887. 
Rept. Minn. Dairv and Food Comm.. 1901. 
Rept. Minn. Dairv and Food Comm.. 1903. 
Bull. N. C. State Bd. of Agr.. 1903. 
Rept. Conn. Agr. Expt. Sta., Pt. 3. 1902. 
Rept. Mass. State Bd. of Health, 1901. 
Rept. Mass. State Bd. of Health, 1903. 
Rept. Ohio Dairy and Food Comm.. 1904. 





16 
4 
9 
4 
15 
10 
14 




6 

1 

1 
1 

14 
\ 

! 

• 




Do 


Rept. Conn. Agr. Expt Sta.. Pt 2. 1903. 


Do 


Kept. Mass. State Bd. of Health. 1901. 


Do 


Rept. Mass. State Bd. of Health, 1903. 




on. Alt. Expt Sta., Pi - 
Rept. Conn. Agr. Expt sta., Pi 




Do 






Frequent. 
Rare. 
do. 


Rept Conn. \av. Expl - 












17 
3 
3 

2 




tin. Agr. Expt Sta., PI 
Rept Ohio Dairv and Food Comm., 1900. 
Rept. Ohio Dairy and Food Comm., 1903. 
Rept. Ohio Dairy and Food Comm., 1904. 

Kept. Ohio Dairv and Food Comm., 1900. 


Not Bpecified 

Do 

Do 







2(> 



FOOD ADULTERATION AND METHODS FOR DETECTION. 



Table YI1I. — Dairy products — Continued. 
MILK. 



Water or removal of fat 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Preservatives 

Do 

Do 

Borax 

Do 

Do 

Do 

Do 

Do 

Do 

Formaldehyde 

ite "f soda, BOdium bicar- 
bonate. 
Ultramarine 



( totaling matter 

Artificial coloring matter, pre- 
servatives, or water. 
Do 



i milk and cream). 

Milk fat deficient*! 

Skimmed milk" 



Extent of adulteration. 



No. 

examined. 



No. sample 
adulter- 
ated. 



16 per cent. 



49.7 per cent, 
49.5 percent. 

49.8 per cent. 
35 per cent. 
31 per cent, 

do. 

27 per cent. 

28 per cent. 
Frequent. 

do. 
do. 
do. 
11 percent. 
Rare, 
do. 
do. 
do. 

do. 

d>. 

do. 

Frequent. 

Rare. 

do. 



432 

422 
(96 

1130 
6 109 

5,793 

.;:;., 
150 
584 

371 
110 
160 

777 

1,199 

1, 129 
172 
28 
23 



50 

28 

30 

1,737 

1,914 

1,979 

56 

35 

52 

95 

111 

22 

132 

141 

301 

302 

142 

4 



Rept. San Francisco Bd. of Health, 1897-8. 
Rept. N. J. Dairy Comm., 1900. 
Rept. Mass. State Bd. of Health, 1S93. 
Rept, Mass. State Bd. of Health, 1894. 
Rept. Mass. State Bd. of Health, 1895. 
Rept. Mass. State Bd. of Health, 1896. 
Rept. Mass. State Bd. of Health, 1897. 
Rept. Mass. State Bd. of Health, 1898. 
Rept. Mass. State Bd. of Health, 1899. 
Rept. Mass. State Bd. of Health, 1900. 
Rept. Wis. Dairy and Food Comm., 1895-6. 
Rept. Mich. Dairy and Food Coram., 1900. 
Rept. Milk Inspector, Providence, R. I. 
Rept, Fa. Dept. Agr., 19C0. 
Rept, Mass. State Bd. of Health, 1899. 
Rept. Ohio Dairy and Food Comm., 1899. 
Kept. Ohio Dairv and Food Comm., 1895. 
Rept. N. J. Dairv and Food Coram., 1895-6. 
Rept. Conn. Agr. Expt. Sta., 1897. 
Kept. Mass. State Bd.of Health, 1900. 
Rept. Pa. Dept. Agr., 1897. 
Rept. Mass. State Bd. of Health, 1899. 
Kept. Mass. State Bd. of Health, 1900. 
Rept. Mass. State Bd. of Health, 1899; Ohio 

Dairy and Food Comm., 1899. 
Bull. 13, Pt. 1, Div. Chem., U. S. Dept. Agr., 

1887. 
Rept. Mass. State Bd. of Health, 1900. 
Rept. Conn. Agr. Expt. Sta., Pt. 2, 1901. 

Rept. Conn. Agr. Expt. Sta., Pt. 3, 1902. 
Rept, Conn. Agr. Expt, Sta., Pt. 2, 1904. 
Rept. Ky. Agr. Expt. Sta., 1902. 
Rept. Mass. State Bd. of Health, 1901. 
Rept, Mass. State Bd. of Health. 1902. 
Rept. Mass. State Bd. of Health, 1903. 
Rept. Mich. Dairy and Food Coram., 1901. 
Rept. Ky. Agr. Expt. Sta,, 1900. 
Rept. Mich. Dairy and Food Comm., 1904. 
Rept, Minn. Dairv and Food Comm., 1901. 
Kept. N. H. State Bd. of Health, 1903-4. 
Rept, Ohio Dairv and Food Comm., 1900. 
Rept, Ohio Dairy and Food Comm., 1901. 
Rept. Ohio Dairy and Food Comm., 1902. 
Rept, Ohio Dairy and Food Comm!, 1903. 
Rept. Ohio Dairy and Food Comm., 1904. 
Kept. Minn. Dairy and Food Comm. ,1903. 
Kept. Conn. Agr. Expt. Sta., Pt. 2. 1904. 
Kept. Ma-s. State Bd. oi Health. 1902. 





OLEOMARGARIN. 


Preservatives and artificial color- 


18 

62 
106 

175 
303 
70 


16 

62 
105 
170 
300 
3 


Rept. Ky. Agr. Expt. Sta., 1900." 


Do 


Rept. Ky. Agr. Expt. ^t-a., 1902. 
Rept. Ohio Dairv and Food Coram., 1900. 
Rept. Ohio Dairy and Food Coram., 1901. 
Rept. Ohio Dairy and Food Coram., 1902. 
Rept. Ohio Dairy and Food Comm., 1903. 


Do 


Do 


Do 


Do 





« In samples of condensed milk. 



EDIBLE FATS AND OILS. 

The substitution for high-priced fats and oils of products of the 
same class but of lower commercial value is very common. Of special 
interest in this connection is the sale of cotton-seed oil, peanut oil, and 
sesame oil for olive oil. Until 1903, when the enforcement of the 
imported food law was begun by the Bureau of Chemistry, much of 



ADULTERATION OF FATS AND OILS. 



27 



the olive oil imported into the country was adulterated by means of 
the oils mentioned. This practice has now been practically stopped. 
At the same time there is no Federal legislation which prevents the 
importation of these oils separately and their mixture in this country, 
and to a certain extent this is done. The relative dietetic properties 
of the various oils have not been carefully studied, and this form of 
adulteration is therefore to be condemned, not because of its bearing 
on dietetics, but because of its fraudulent nature. 

Lard is often mixed with other fats, such as tallow and cotton-seed 
oil. Such mixtures are legitimate when sold as compound lard, but 
that their sale as lard has been practiced to a considerable extent is 
shown by the following table: 

Table IX. — Edible fats and oils. 

LARD. 



Extent of adulteration 



No.. samples 
adulter- 
ated. 





Very frequent 


Do.. 


Do 


do. 


Do 


do. 


Do.. 


do. 


Do 


do. 


Do 


do. 


Do 


do. 


Do 


22 per cent. 

Verv frequent 

do. 


Beef stearin 

Do 


Do 


do. 


Do... 


do. 


Do. 


do 


Cotton-seed oil and beef stearin. . . 


171 
134 
•10 
14 
23 
5 
275 
32 
22 
51 
1, 175 
36 




Do 




Do 




Do 




Do.... 




Do 




Do . . 




Cotton-seed oil and lard stearin . . 
Cotton-seed oil and beef stearin... 

Cotton-seed oil and tallow 

Not specified 





Rept. Ohio Dairy and Food Comm., 1895. 
Rept. Conn. Agr. Expt. Sta., 1900. 
Rept. N. J. Dairy and Food Comm., 1898. 
Rept. Minn. Dairy and Food Comm., 1901. 
Bull. 13. Pt.4. Div. Chern., U.S. Dept. Agr. 
Bull. X. C State Bd. Agr., 1900. 
Rept. Conn. Agr. Expt. Sta., 1896. 
Rept. Mass. State Bd. of Health, 1900. 
Rept. Mass. State Bd. of Health, 1899. 
Rept. Ohio Dairy and Food C<>rnm.,1895. 
Rept. Conn. Agr. Expt. Sta., 1900. 
Rept. Minn. Dairy and Food Comm., 1901. 
Bull. 13, Pt. 4, Div. Chem., U. S. Dept. Agr., 

1889. 
Rept. Conn. Agr. Expt. Sta., 1896. 
Rept. Conn. Agr. Expt. Sta., Pt. 3, 1902. 
Rept. Conn. Agr. Expt. Sta., Pt. 2, 1903. 
Rept. Kv. Agr. Expt. Sta., 1900. 
Rept. Kv. Agr. Expt. Sta., 1902. 
Rept. Mass. State Bd. Health, 1901. 
Kept. Mich. Dairy and Food Comm., 1904. 
Rept. Minn. Dairy and Food Comm., 1901. 
Bull. X. C. State Bd. Agr.. 1903. 
Rept. Mass. State Bd. Health, 1902. 
Rept. Mass. State Bd. Health, 1903. 
Rept. Minn. Dairy and Food Comm., 1903. 
Rept. Ohio Dairy and Food Comm., 1903. 



OLIVE OIL. 



Cotton-seed oil 

Do 

Do 

Do 

Do.: 

Do 

Do 

Do 

Do 

Cottonseed oil (California) 

Cotton-seed oil (French) .. 
Cotton-sued oil i Italian | .. 

Peanut oil 

Other seed oils 

Corn oil 

Sesame oil 

Do 

Do 

Mustard-seed oil 

Poppy-seed oil. 

Not specified 



Very frequent. Rept. San Francisco Bd. Health, 1897-8. 

do. Rept. Conn. Agr. Expt. Sta., 1897. 
do. , BuH.N.C.Bd. Agr., 1900. 

do. Rept. Mass. State Bd. Health, 1900. 

30 per cent. Rept. Conn. Act. Expt. Sta., 1900. 
Verv frequent. i Senate Rept., 561, 1900. 

do. Bull. 129. Cal. Agr. Expt. Sta.. 1S99. 
5 5 Rept. Ohio Dairy and Food Comm., 1896. 

Yen- frequent. Rept. Bd. Health, Oakland, CaL.1899. 

15 per cent. Bull. 77. Bureau Chem., U. S. Dept. Agr. 
1903. 

9 per cent. Do. 

10 per cent. Do. 
21 per cent. Do. 

Infrequent. Kept. Conn. Agr. Expt. Sta., 1900. 

do. Rept. Mass. State Bd. Health, 1900. 

Rare. Rept. Conn. Agr. Expt. Sta.. 1897. 

do. Rept. Conn. Agr. Expt Sta., 1900. 

do. Bull. 77, Bureau Chem., V. s. Dept. Agr., 

Infrequent. Rept.Sarj Francisco Bd. Health, 1897. 

do. Rept Ohio Dairy and Food Comm., 1899. 
5 I 2 Rept Ohio Dairy and Food Comm., 1901. 



28 FOOD ADULTERATION AND METHODS FOR DETECTION. 

The lard sold in tropical and subtropical countries is of a differei^c 
nature from that sold in cooler places. It is stated by manufactur- 
ers that natural lard is too soft a product for marketing in warm 
weather, and that it can be greatly improved in this respect by the 
addition of a fat of a firmer nature. For this purpose stearin, that 
portion of the ordinary fats which melts at the highest temperature, 
is sometimes employed. Stearin is prepared by heating fat such as 
beef suet or lard to a temperature sufficient to melt a portion of the 
product, but insufficient to melt stearin, and then filtering by means of 
pressure through bags prepared for that purpose. The stearin which 
is not melted is frequently added to the commercial lard for the pur- 
pose of making it more firm than it otherwise would be, as stated 
above. Less stearin is necessary for this purpose in winter than in 
summer, and less in cool climates than in hot. A considerable portion 
is employed for lard used in tropical countries. Beef stearin is some- 
times employed for this purpose, although lard stearin is frequently 
used, especially in the preparation of lard intended for States forbid- 
ding the addition of beef fat to lard. 

FLAVORING EXTRACTS. 

The class of products comprising flavoring extracts is very fre- 
quently adulterated. Artificial extracts are commonly sold instead of 
those prepared from natural sources, and cheaper products than those 
supposed to be used are often employed. For instance, tonka beans 
are used instead of vanilla beans in the preparation of supposed vanilla 
extract, and artificial vanillin, prepared from oil of cloves, is very 
commonly employed in the preparation of the cheapest grade of 
vanilla extract. 

Lemon extract, -upposed to be manufactured by dissolving lemon 
oil in alcohol, may be made from lemon grass. Lemon oil is some- 
times treated by distillation with steam, and the nonvolatile portions 
employed in the preparation of lemon extracts, while the volatile por- 
tions containing the terpenes (an essential characteristic of lemon oil) 
of the oil are sold as lemon oil. Practically the same forms of adul- 
teration are practiced with other classes of flavoring extracts. 

Lemon oil is almost insoluble in water, and a fairly strong alcohol 
is required to obtain it in the strength desired for flavoring purposes. 
Many manufacturers have unintentionally violated the law by attempt- 
ing to dissolve lemon oil in alcohol that is not sufficiently strong. 
They frequently believe that their extract is up to the standard when 
as a matter of fact only a small portion of the oil they employ is 
dissolved in the weak alcohol, and the remainder is unintentionally 
discarded. A lemon extract having but a small amount of alcohol 
must necessarily have a low percentage of oil of lemon. 



ADULTERATION OF FRUIT PRODUCTS. 



29 



Table X. — Flavoring extracts. 
LEMON EXTRACT. 



Extent of adulteration. 



No. samples Xo ad X P r leS 
examined. a ^ er 



Lemon gTass 

Mace, capsicum, etc 

Foreign coloring matter 

Do 

Do 

Foreign color and insufficient 
amount lemon oil. 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Foreign color 

Low in lemon oil 



Frequent. 

do.' 

do. 
do. 



167 

16 

27 

159 

4 

53 

10 

Frequent. 

Occasional. 



a 58 



Rept. Ohio Dairy and Food Comm., 1897. 
Rept. Ohio Dairv and Food Comm., 1898. 
Rept. 111. Food Comm., 1899. 
Rept. Conn. Agr. Expt. Sta., Pt. 2, 1901. 



139 Rept. Mass. State Bd. Health, 1901. 
13 Rept. Mass. State Bd. Health, 1902. 
19 Rept. Mass. State Bd. Health, 1903. 
56 Rept. Mich. Dairy and Food Comm. 
2 Rept. Minn. DairV and Food Comm 
34 Rept. N. H. State Bd. Health, 1903-4. 
7 | Rept. X.D. Agr. Expt. Sta., 1902. 
Rept. X. D. Agr. Expt. Sta., 1905. 
Do. 



1904. 
, 1903. 



V AXILLA EXTRACT. 



Coumarin 


Very frequent. 




Vanillin 


do. 




Coumarin 


do. 




Do 


do. 




Coumarin and vanillin 


do. 




Do 


26 | 


20 


Do 


Very frequent. 




Do 


62 I 


647 


Do 


73 


54 


Do 


18 


15 


Do 


25 


12 


Do 


32 1 


21 


Tonka 


Verv frequent. 






Frequent. 








Low-grade extract of coumarin . . . 


Rare. 





Rept. Ohio Dairy and Food Comm., 1899. 
Rept. Ohio Dairv and Food Comm., 1898. 
Rept. Mass. State Bd. Health., 1900. 
Rept. Ohio Dairy and Food Comm., 1897. 
Rept. Mich. Dairv and Food Comm., 1900. 
Rept. 111. Food Comm., 1899. 
Rept. Ohio Dairv and Food Comm., 1895. 
Rept. Conn. Agr! Expt. Sta., Pt. 2, 1901. 
Rept. Mass. State Bd. Health, 1901. 
Rept. Mass. State Bd. Health. 1902. 
Rept. Mass. State Bd. Health, 1903. 
Rept. X. H. State Bd. Health, 1903-4. 
Rept. Mass. State Bd. Health, 1890. 
Rept. X. D. Agr. Expt. Sta., 1905. 

Do. 

Do. 



MISCELLANEOUS. 



Coloring matter and artificial 
flavors (strawberry and rasp- 
berry). 
Foreign colors, deficiency of oil 

(orange). 
Cane sugar, cornstarch, coumarin 

(powder). 
Only a trace of ginger oil present 

i Jamaica ginger). 
Artificial preparations and foreign 
colors.c 

Do 

Do 

Do 




18 Rept. Conn. Agr. Expt. Sta., Pt. 2. 1901. 



Rept. Conn. Agr. Expt. Sta., Pt. 2, 1901. 

Rept. Mich. Dairy and Food Comm., 1904. 

Rept. Mass. State Bd. Health, 1903. 

Rept. Mich. Dairy and Food Comm., 1901. 

Rept. Mich. Dairv and Food Comm., 1904. 
Rept. Ohio Dairy and Food Comm., 1901. 
Rept. Ohio Dairv and Food Comm., 1902. 



ai labeled "compounds." 6 6 labeled "compounds." 

FRUIT PRODUCTS. 



■Kind not specified. 



The class of goods known as fruit products includes jams, jellies, 
marmalades, and dried and preserved fruits of every description. 
Glucose is often used as a substitute for cane sugar, and coloring matter 
is employed in order that the color of the finished article may stand 
for a considerable time on the shelves in the light without deterioration. 
Coloring matter is also used with cheap fruits in the preparation of a 



30 



FOOD ADULTERATION AND METHODS FOR DETECTION. 



product supposedly made from more expen-ive products. For instance, 
jellies are sometimes made of glucose and apple juice, the latter having 
been prepared from peelings and coves, the by-product of the manu- 
facture of dried apples. These jellies may be flavored and colored 
to represent the jelly of high-priced fruits, or they maybe sold without 
additional flavor and as a low-priced product Always, however, when 
thi* product of a high-priced fruit is imitated artificial coloring matter 
is employed. 

Apple juice, as mentioned above, and especially the product obtained 
from peelings and cores, is used extensively with the cheaper grades 
of jellies where but little fruit is used. With the cheapest grade of 
goods, starch La often used as a filler and gelatinizing agent. 

rvatives, such as salicylic acid and benzoic acid, are often 
employed with jellies and jams. Their purpose is twofold: First, to 
preserve apple juice in barrels until it is desired in the manufacture of 
the finished product: second, to prevent molding in the finished article 
which i- subjected to much less favorable condition- during transpor- 
tation on trains and in heated storerooms than is the caseof the domes- 
tic product, which stands quietly, often in a cool, dark cellar, from the 
time it i- made until it i- 

The exhau-ted fruit residue from the manufacture of jelly is some- 
sed for the preparation of jams, giving to the latter th 
and other insoluble material of the fruit supposed to be present. while 
the soluble material is frequently made up of glucose. Occasionally 
foreign seedsare used for this purpose. Glucose, as has been already 
mmonly used in the cheaper varieties of fruit product-, and 
sometime-, though very rarely, saccharin i- employed for sweetening. 

Table XI. — Fntii prod 

JAMS. 



Extent of adulteration. 



N'o. samples 





Do 



Do 

matter 



Apple juice 

Saccharin 

Organic arid* 

Artificial flavors 

Fig-, apple pulp, appl 
exhausted pulp. 

I atives, artificial 



47 
Frequent. 

do. 

do. 



Bull. 66, Bureau of Chem.,U.S. Dept. Agr., 

1902. 
Kept. Conn. .Agr. Expt. St 
Bull. 66, Bureau of Chem.. V. S. Dept Agr., 

Kept. Conn. Agr. Expt. 81 

I hem., U. -Dept. Agr., 

- 
Rept. Conn. Agr. V. 

Bull. 66, Bureau of Chem., U. S. Dept. Agr., 
1902. 
Do. 
Senate Rept. 516. pp. 22, 23, 1900. 

Do. 
Bull. 66, Bureau of Chem. .T'. - | 

1902. 
Rept. Conn. Agr. Expt. Sta., Pt. 2, 1901. 



a 10 labeled -compounds." 



ADULTERATION OF MEAT PRODUCTS. 



31 



Table XL — Fruit products — Continued. 

JELLIES. 



Extent of adulteration. 



examined. a * te Jj e 


a 44 




26 


32 




18 


64 




42 


44 




15 


64 




10 


44 




11 


32 




14 


64 




SSI 


Usual. 




13 1 


7 


Occasional. 




44 1 


1 


Occasional. 




16 




5 


38 




628 



Do 

Do 

Preservatives. 



Do 

Coloring- matter . 



Do 

Do 

Apple juice. 



Strlivh . 



Saccharin 

Organic acids 

Artificial flavors 

Glucose, starch paste, preserva- 
tive, artificial colors. 



Bull. 66, Bureau of Chem., U. S. Dept. Agr., 

1902. 
Rept. Minn. Dairv and Food Comm., 1900. 
Rept. Conn. Agr. Expt. Sta., 1898. 
Bull. 66, Bureau of Chem., U. S. Dept. Agr., 

1902. 
Rept. Conn. Agr. Expt. Sta., 1898. 
Bull. 66, Bureau of Chem., U. S. Dept. Agr.. 

1902. 
Rept. Minn. Dairy and Food Comm., 1900. 
Rept. Conn. Agr. Expt. Sta., 1898. 
Bull. 66, Bureau of Chem., U. S. Dept. Agr., 

1902. 
Rept. Ohio Dairv and Food Comm., 1897. 
Bull. 66, Bureau of Chem., U. S. Dept. Agr.. 

1902. 
Do. 
Senate Rept. 516, pp. 22, 23, 1900. 
Rept. Ohio Dairv and Food Comm., 1899. 
Rept. Conn. Agr. Expt. Sta., Pt. 2, 1901. 



JELLIES AND JAMS. 



Glucose, starch paste, preserva- 
tives, artificial colors. 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Preservatives 

Coal-tar dyes 

Saccharin 




18 Rept. Ky. Agr. Expt. Sta., 1900. 



Rept. Kv. Agr. Expt. Sta., 1902. 
Rept. Mass. State Bd. Health, 1902. 
Rept. Mass. State Bd. Health, 1903. 
Rept. Mich. Dairy and Food Comm., 1901. 



71 Rept. Mich. Dairy and Food Coram., 190£ 



Rept. Minn. Dairy and Food Comm., 1901. 
Rept. Minn. Dairv and Food Comm.. 1903, 
Bull. N. C. State Bd. Agr., 1902. 
Bull. X. D. Agr. Expt. Sta., 1902. 
Rept. Ohio Dairv and Food Comm., 1900. 
Rept. Ohio Dairv and Food Comm., 1901. 
Rept. Ohio Dairv and Food Comm., 1902. 
Rept. X. D. Agr. Expt. Sta., 1905. 

Do. 

Do. 



WHOLE FRUITS. 





74 

74 
74 

74 
6 


13 

10 
10 

1 

6 






1902. 
Do. 




Do. 








' 







a 12 labeled "compounds." 610 labeled "compounds." c In maraschino cherries. 

MEAT PREPARATIONS. 

In this class of foods are considered f resti and prepared meat, fish, 
crabs. oysters, and similar products. The fresh moats on the market 
are rarel} T subject to adulteration. Packers depend entirely on cold 
storage for their preservation, and the}- are kept at a low temperature. 
not only in the packing house, but also in refrigerator cars in transit 
and in cold-storage rooms at their destination until immediately before 
they go into consumption. 



32 



F»k>D ADULTERATION AND METHODS FOR DETECTION. 



In fresh meats, however, preservatives are sometimes employed by 
retail dealers who have not efficient refrigerator service or who desire 
to keep fresh meat for a considerable time on the block. For this 
purpose powdered preparations of preservatives are employed, and 
dusted over the meat from time to time. 

All varieties of meat that are sold in a finely comminuted state, such 
as chopped meat, Hamburg steak, and sausage, are likely to have a 
preservative added in their preparation. B}^ this statement it is not 
meant that preservatives are added in all cases. Their use, however, 
simplifies the keeping of such preparations and is not unusual. The 
preservatives most commonly employed with meat are borax or boric 
acid and sulphites. Oysters, when kept in bulk after shucking, are 
also frequently preserved. 

It is frequently pointed out by manufacturers that the addition of 
preservatives does not restore the fresh character of spoiled meat and 
that they can not be used for this purpose. As has been stated above, 
however, (p. 1-t) sometimes meat, especially in a finely comminuted 
condition, frequently loses its natural fresh color before there is an}- 
other evidence of deterioration. This color is restored to a certain 
extent by the addition of sulphites, and the color is very materially 
preserved if sulphites are added at the time of the preparation of 
chopped meat. Moreover, manufacturers of chemical preservatives 
frequently add a small amount of coal-tar color to preservatives con- 
sisting of sulphites intended to be added to meat. 

One of the most objectionable forms of adulteration practiced in 
connection with meat is the sak> of the flesh of immature calves. This 
practice is forbidden in practically all of the States, but the enforce- 
ment of such laws has sometimes been found very difficult. Particular 
difficulty has been experienced in this matter in New York. 

Table XII. — Meat preparations. 
MEAT CURED. 



Extent of adulteration. 



No. samples 
examined. 



No. samples 
adulter- 
ated. 



Preservatives. 



Borax and decomposed 

Borates 

Sulphites 



Frequent. 

11 

2,066 

11 

Frequent, 
do. 



Bull. 13, Pt. 10, Bureau Chem., U. S. 
Dept. Agr., 1902. 
Do. 
Rept. Minn. Dairy and Food Comm.,1903. 
Rept. Ohio Dairv and Food Comm., 1900. 
! Rept. N.D. Agr. Expt.Sta., 1905. 
Do. 



OYSTERS AND LOBSTER. 



Fish, meat, etc. (in lohster) 

Preservatives 

Borax 

Not specified 

Do 




Rept. Ohio Dairv and Food Comm., 1900. 

Rept. Mich. Dairv and Food Comm., 1901. 

50 Rept. N. H. State Bd. of Health, 1903-4. 

1 Rept. Ohio Dairy and Food Comm. ,1901. 

6 Rept. Ohio Dairy and Food Comm., 1902. 



ADULTERATION OF SPICES. 

Table XII. — Meat preparations — Continued. 
POTTED MEATS, PATES, ETC. 



33 



Extent of adulteration. 



No. samples 
adulter- 
ated. 



Substitution of cheaper varieties Frequent. 

of meats. 

Do do. 

Do do. 

Do do. 

Preservatives i do. 

Do , do. 



Jull.13, Pt. 10, Bureau Chem.,U.S. Dept. 
Agr.,1902. 



Bull. 13, Pt. 10, Bureau Chem., U. S. Dept. 
Agr.,1902. 



Boric acid . 
Do 



Excess of starch. 

Borax 

Not specified 

Do 



„ 


14 


25 


15 


19 


10 


13 


12 


75 


51 


27 


23 



Rept. Conn. Agr. Expt. Sta., 1898. 

Bull. 13, Pt. 10, Bureau Chem., U.S. Dept. 

Agr.,1902. 
Rept. Conn. Agr. Expt. Sta., 1898. 
Rept. N. H. State Bd. of Health, 1903-4. 
Rept. Ohio Dairy and Food Comm., 1901. 
Rept. Ohio Dairy and Food Comm., 1902. 



MISCELLANEOUS. 



Not specified (in ham) 

Not specified (in Hamburger steak) 
Preservatives (in fresh meat) 



Preservatives (in soup) 



Frequent. 



Rept. Ohio Dairv and Food Comm., 1902. 
Do. 

Bull. 13, Pt. 10, Bureau Chem., U.S. Dept. 
Agr.,1902. 

Unpublished results, Bureau of Chemis- 
try. 



SPICES. 

Spices offer rnanj 1 " opportunities for the food adulterator. They are 
usually sold after being ground, and for that reason are easily imi- 
tated. Practically all varieties of ground spices are adulterated by 
some grinders and in some markets. The products ordinarily used 
for the purpose of adulterating spices are cereals and cereal products 
(such as ground wheat and Indian corn), ground shells of cocoanuts, 
almond shells (sometimes parched), olive pits, and sawdust. The 
cheaper varieties of spices are sometimes substituted for the more val- 
uable kinds, and stems, husks, etc., may be added. These adulterants 
are mainly objectionable because of the fraud connected with their use. 

Products are made in imitation of the various spices and sold fal- 
si or 5 cents a pound to mixers and others who use them in the prep- 
aration of low-grade goods, while the products that they imitate 
are worth from 16 to 60 cents a pound. These articles (enumerated 
above) have the physical appearance of the spices they are intended to 
represent, but are entirely without any spice flavor. They are some- 
times colored with coal-tar derivatives, or other coloring matter, for 
the purpose of more nearly simulating the spices they are intended to 
imitate. 



34 



FOOD ADULTERATION AND METHODS FOR DETECTION. 



Colors, stems, and cocoanut shells are imported into the United 
States in considerable quantity for the purpose of adulterating spices. 
Bombay mace and wild mace are products belonging to the same class 
of plant products as true mace and bear a general resemblance to it, 
but they have very little flavoring power, and hence constitute an 
adulteration when mixed with it. 

Table XIII.— Spices. 

ALLSPICE. 





Extent of adulteration. 




Adulterant. 


No. samples 
examined. 


No. samples 

adulter- 
ated. 


Reference. 




21 
23 
4 
21 
23 
10 
23 
10 
23 
10 
10 
10 
10 
164 
23 
21 
16 

34 

28 

151 

146 

184 

2 

3 

54 

4 


2* 
6 
3 
1 
5 
1 
2 
1 
2 
2 
1 
1 
5 

11 
4 
6 

1 
8 


9 

1 
1 
4 

4 


Rept. Conn. Agr. Expt. Sta., 1898. 
Do. 


Do 




Rept. Ohio Dairy and Food C'omm.,1895. 
Kept. Conn. Agr. Expt. Sta., 1898. 
Rept. Conn. Agr. Expt. Sta., 1897. 
Kept. Mich. Dairy and Food Comm.,1900. 
Rept. Conn. Agr. Expt. Sta., 1897. 
Kept. Mich. Dairv and Food Comm.,1900. 
Kept. Conn. Agr. Expt. Sta., 1897. 
Rept. Mich. Dairy and Food Comm.,1900. 
Do. 




Do 


Do 






Wheal 








Rept. Midi. Dairy and Food Comm.,1900. 
Kept. Mass. State Bd. Health, 1900. 
Do. 




Do 


Do 


Rept. Conn. Agr. Expt. Sta., 1897. 
Rept. Conn. Agr. Expt. Sta., 1898. 
Rept. Conn. Agr. Expt. Sta., Pt. 2, 1901. 

Rept. Conn. Agr. Expt. Sta., Pt. 3, 1902. 
Kept. Conn. Agr. Expt. Sta., Pt. 2, 1904. 
Kept. Mass. State Bd. Health, 1901. 


j >< > 


ins, cocoanut Bhella, 
wheat, starchy matter, 

1),. 


Do 


Do 


Do.... 


Kept. Mass. State lid. Health, 1902. 


Do 


Rept. Mass. State Bd. Health, 1903. 


Do, . 




Do 




Do 


Kept. Minn. Dairy and Food Comm., 1901. 
Bull. N. C. State Bd. Agr., 1902. 


l><, 







CINNAMON AND CASSIA. 



Foreign nark 

Foreign woody material 

Wood and red' sandalu 1 

Woody liber 

Foreign starchy ma Iter 

Wheal '. 

Wheat ( probably biscuit i 

Bread or crackers 

Buckwheat 

r or hulls 

Ginger 

Turmeric 

Charcoal 

Band 

Sand in excess 

Gynsum 

All adulterants 

Do 

Do 

Wheal middlings, cotton-seed 
meal, cocoanut shells and 
by matter." 

Do.a 

Do.a 

Do.« 

Do.« . 

Do.a 

Wheat, exhausted ginger, turmer- 
ic, b 

Do.6 

Do.6 




Rept. Mass. 
Rept. Mich. 
Rept. Conn 
Kept. Ohio 
Kept. Mich 
Rept. Conn 

Do. 
Rept. Ohio 
Kept. Conn 
Kept. Ohio 
Rept. Conn 
Rept. Ohio 

Do. 
Kept. Conn 
Rept. Mich 
Rept. Ohio 
Rept. Conn 
Rept. Ohio 

Do. 
Rept. Conn 



State Bd. Health, 1S00. 

Dairy and Food Comm.,1900. 
.Agr. Expt. Sta., 1897. 
Dairy and Food Comm., 1895. 

Dairv and Food Comm., 1900. 
. Agr. Expt. Sta., 1897. 

Dairv and Food Comm., 1895. 

.Agr. Expt. Sta., 1897. 

Dairy and Food Comm., 1895. 

.Agr. Expt. Sta., 1898. 

Dairy and Food Comm., 1895. 

.Agr. Expt. Sta., 1897. 

. Hairy and Food Comm., 1900. 

Dairy and Food Comm., 1895. 

.Agr. Expt. Sta., 1897. 

Dairy and Food Comm., 1895. 

.Agr. Expt. Sta., Pt. 2, 1901. 



Rept. Conn. Agr. Expt. Sta., Pt, 3, 1902. 
K.pt. ( !i inn. Agr. Expt. Sta., Pt. 2, 1904. 
Rept. Mich. Dairv and Food Comm., 1901. 
Rept. Minn. Dairv and Food Comm., 1901. 
Kept. Ohio Dairy and Food Comm., 1903. 
Rept. Mass. State Bd. Health, 1901. 

Rept. Mass. State Bd. Health, 1902. 
Rept. Mass. State Bd. Health, 1903. 



i In cinnamon only. 



bin cassia only. 



ADULTERATION OF SPICES. 



35 



Table XIII. — Spices — Continued. 
CLOVES. 





Extent of adulteration. 










Adulterant. 


No. samples 
examined. 


No. samples 
adulter- 
ated. 


Reference. 


Cocoanut shells 

Do 


37 
20 
37 
20 
37 


7 
1 
10 
2 
2 
1 
2 
3 
1 
2 

11 

11 
14 

1 
17 

4 

6 
5 
19 
31 
21 

32 


Rept. Conn. Agr. Expt. Sta., 1897. 
Rept. Conn. Agr. Expt. Sta., 1898. 
Rept. Conn. Agr. Expt. Sta., 1897. 
Rept. Conn. Agr. Expt. Sta., 1898. 
Rept. Conn. Agr. Expt. Sta., 1897. 
Rept. Conn. Agr. Expt. Sta., 1893. 
Rept. Conn. Agr. Expt. Sta., 1897. 
Rept, Conn. Agr. Expt. Sta., 1898. 
Rept. Conn. Agr. Expt. Sta., 1897. 
Bull 13, Pt. 2, Div. Chern., U. S. Dept. Agr., 

1887. 
Rept. Ohio Dairy and Food Comm., 1895. 
Do. 


Wheat or starchy matter 


Do 


20 

37 
20 
37 
11 

12 
12 

1 

37 
20 

17 

43 
23 
163 
196 
208 
2 




Clove stems 








Do 

Woody matter 

All adulterants 

Do 

Clove stems, cocoanut shells, 
wheat products, roasted peas, 
starchy matter. 
Do. ' . 


Rept. Ohio Dairy and Food Comm., 1897. 
Rept. Mich. Dairy and Food Comm., 1900. 
21st Ann. Rept. Conn. Agr. Expt. Sta., 1S97. 
22nd Ann. Rept. Conn. Agr. Expt. Sta., 

1898. 
Rept, Conn. Agr. Expt, Sta., 1901. 

Rept. Conn. Agr. Expt. Sta., 1902. 
Rept. Conn. Agr. Expt. Sta., 1904. 
Rept. Mass. State Bd. Health, 1901. 
Rept. Mass. State Bd. Health, 1902. 
Rept. Mass. State Bd. Health. 1903. 
Rept. Mich. Dairy and Food Comm., 1901. 
Rept. Minn. Dairy and Food Comm., 1901. 
Bull. N. C. State Bd. Agr., 1902. 


Do 


Do 

Do 


Do 


Do 

Do 


Do 





GINGER. 


91 


20 


4 


1 


91 


1 


91 


2 


91 


1 


4 


1 


91 


1 


91 


11 


4 


1 


91 


3 


7 


4 


4 


2 


91 


24 


234 


11 


4 


3 


31 


o 


253 


20 


246 


17 


224 


9 


m 


13 


2 


2 



Rice middlings 

Rice hulls and rice flour 

Corn meal 

Wheat 

Mustard hulls 

Cayenne 

Sawdust 

Turmeric 

Do 

Gypsum 

Not specified 

Do 

All adulterants 

Do 

Do 

Wheet, rice, dirt, turmeric, buck 
wheat. 

Do 

Do 

Do 

Do 

Do 



Rept. Conn. Agr. Expt. Sta., 1898. 

Rept. Ohio Dairy and Food Comm., ]S95. 

Rept. Conn. Agr. Expt. Sta., 1898. 

Do. 

Do. 
Rept, Ohio Dairy and Food Comm., 1895. 
Rept. Conn. Agr. Expt, Sta., 1898. 

Do. 
Rept. Mich. Dairy and Food Comm., 1900. 
Rept. Conn. Agr. Expt. Sta., 1898. 
Bull. 13, Pt. 2, Div. Cheru.. U. S. Dept. Agr.. 

1887. 
Rept, Ohio Dairy and Food Comm., 1895. 
Rept. Conn. Agr. Expt. Sta., 1898. 
Rept. Mass. State Bd. Health. 1900. 
Rept. Ohio Dairy and Food Comm.. 1895. 
Rept, Conn. Agr. Expt. Sta., Pt. 2. 1901. 

Rept. Mass. State Bd. Health. 1901. 
Kept. Mass. State Bd. Health. 1902. 
Kept. Mass. state Bd. Health. 1903. 
Rept Minn. Dairy and Food Comm.. 1901. 
Bull. N. C. State Bd, Agr., 1902. 



Bombay mace, corn starch, cere 
als, turmeric, wild mace. 

Do 

Do 

Do 

Ho 




Rept. Conn. Agr. Expt. Sta.. Pt.3, 1902. 

Rept. Mass. State Bd. Health. 1901. 
Rept. Mass. State Bd. Health, 1902. 
Rept Mass. State Bd. Health, 1903. 
Rept. Mich. Dairy and Food Comm., 1904. 



36 



FOOD ADULTERATION AND METHODS FOR DETECTION. 



Table XIII. — Spices — Continued. 

MUSTARD. 



Extent of adulteration. 



No-samples^^ 1 * 8 
examined. "^Jf 1 



Mustard cake 

Oil cake 

Seeds of radish 

Beeds of rape 

Seeds of Siuaj>i.~ 

Seeds of cayenne 

ginger 

Wheat flour 

Wheat product 

Do. 

Corn meal 

Corn starch 

Starchy materials 

Starch 

Do 

Lime or plaster 

Clay 

Turmeric 

Do 

Do 

Do 

Martins yellow 

Do 

Color not specified 

Do 

Volatile oil removed 

Not specified 



Starchy materials, mustard hulls. 

turmeric. 
All adulterants 

Do 

Do 

Do 

Wheat, corn Hour, plaster, turmer- 
ic, starchy matter. 

Do : 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Not specified 

Do 

Do 



35 | 
Infrequent, 
do. 
do. 
do. 
do. 



69 
Infrequent. 
09 
39 
35 
36 



Rept. Ohio Dairy and Food Comm., 1897. 

Do. 
Bull. 51, Div. Chem., U. S. Dept. Agr., 1898. 

Do. 

Do. 

Do. 

Do. 
Kept. Ohio Dairy and Food Comm., 1895. 
Kept. Mich. Dairy and Food Comm., 1900. 
Rept. Ohio Dairy and Food Comm., 1897. 

Do. 
Rept. Mich. Dairv and Food Comm., 1900. 
Bull. 123, Conn. Agr. Expt. Sta., 1896. 
Kept. Ohio Dairy and Food Comm., 1895. 
Kept. Mich. Dairv and Food Comm., 1900. 
Bull. 123, Conn. Agr. Expt. Sta., 1896. 
Bull. 51 , Div. Chem., U. S. Dept. Agr., 1898. 
Bull. 123, Conn. Agr. Expt. Sta., 1896. 
Rept. Ohio Dairv and Food Comm., 1895. 

Do. 
Rept. Mich. Dairv and Food Comm., 1900. 
Bull. 123, Conn. Agr. Expt. Sta., 1896. 
Kept. Ohio Dairv and Food Comm., 1895. 

Do. 
Rept. Ohio Dairv and Food Comm., 1897. 

Do. 
Bull. 13, Pt. 2, Div. Chem., U. S. Dept. Agr. 

1887. 
Kept. Mass. State B 1. Health, 1900. 

Rept. Ohio Dairy and Food Comm., 1895. 
Rept. Ohio Dairv and Food Comm., 1897. 
Kept. Mich. Dairv and Food Comm., 1900 
Bull. 123, Conn. Agr. Expt. Sta., 189G. 
Kept. Conn. Agr. Expt. Sta., Pt. 2, 1901. 

Rept. Conn. Agr. Expt. Sta.. Pt. 2, 1904. 
Kept. Mass. State Bd. Health, 1901. 
Kept. Ma-s. State Bd. Health, 1902. 
Kept. Ma-s. State Bd. Health, 1903. 
Kept. Mich. Dairv and Food Comm., 1901. 
Rept. Mich. Dairy and Food Comm., 1904. 
Rept. Minn. Dairv and Food Comm., 1901. 
Bull. N. C. State Bd. Agr., 1902. 
Bull. N. C. State Bd. Agr., 1903. 
Rept. Ohio Dairv and Food Comm., 1900. 
Rept. Ohio Dairy and Food Comm., 1901. 
Rept. Ohio Dairy and Food Comm., 1903. 



NUTMEGS. 




15 


1 


Rept. Mass. State Bd. Health, 1900. 




PAPRIKA. 




. 


Rept. Mass. State Bd. Health, 1900. 




PEPPER. 



Buckwheat < flour or hulls) 

Do 

Wheat 

Do 

Wheat product 

Grain hulls 



Rice product 

Pea or bean shells 

Corn meal 



Bull. 123, Conn. Agr. Expt. Sta., 1896. 
Rept. Ohio Dairv and Food Comm., 1895. 
Bull. 123, Conn. Agr. E^pt. Sta.. 1896. 
Kept. Mich. Dairy and Food Comm., 1900. 
Rept. Ohio Dairy and Food Comm., 1895. 
Bull. 123. Conn. Agr. Expt. Sta., 1896. 
Rept. Mich. Dairv and Food Comm., 1900. 
Kept. Ohio Dairv and Food Comm., 1895. 

Do. 
Rept. Ohio Dairy and Food Comm., 1897. 



ADULTERATION OF SUGAR PRODUCTS. 



37 



Table XIII.— Spieea — Continued. 
PEPPER— Continued. 



Extent of adulteration. 



Adulterant. 



^^f^ult 



Farinaceous matter 

Cocoanut shells 

Do : 

Cayenne 

Do 

Do 

Ginger, pepper shells, olive stones. 

Red sawdust 

Foreign hulls 

Sawdust 

Do 

Charred matter 

Sand in excess 

Turmeric 

Coloring matter 

Not specified 

Do : -. 

All adulterants 

Do 

Ginger, pepper shells, olive stones, 
buckwheat. 

Do 

Wheat, cocoanut shells, mustard 
hulls, corn meal.a 

Do 

Do 

Corn meal, wheat, buckwheat mid- 
dlings, b 

Do.f' 

Do. ft 

Plaster, wheat, corn meal, coal-tar 
dye. dirt, ginger, pepper shells, 
olive stones, s i wdust.c 

Do.c 

Do. c 

Do.c 

Do.c 

Do.c 

Do 

Red sandalwood c 

Red woody matter c 

Starchy matter | wheat) c 

Starchy matter i corn )c 

Buckwheat <-■ . . .-. 

Red dye •• -. 

Aniline dyestuifs c 

All adulterants c 

Do.c 

Do.c 



Rept. Ohio Dairy and Food Comm., 1895. 
Bull. 123, Conn. Agr. Expt. Sta., 1896. 

Do. 
Rept. Ohio Dairy and Food Comm., 1895. 
Bull. 123, Conn. Agr. Expt. Sta., 1896. 
Rept. Ohio Dairy and Food Comm., 1895. 
Rept. Ohio Dairv and Food Comm., 1897. 
Rept. Mass. State Bd. Health, 1900. 
Rept. Mich. Dairv and Food Comm.. 1900, 

Do. 
Bull. 123. Conn. Agr. Expt. Sta., 1896. 
Rept. Ohio Dairv and Food Comm., 1895. 
Bull. 123, Conn. Agr. Expt. Sta., 18%. 
Rept. Mich. Dairy and Food Comm., 1900 
Rept. Ohio Dairv and Food Comm., 1^95. 
Rept. Ohio Dairv and Food Comm., 1897. 
Rept. Conn. Agr. Expt. Sta., 1898. 
Bull. 13, Pt. 2, Div. Chem.. U. S. Dept. Agr. 
Bull. 123, Conn. Agr. Expt. Sta., 1896. 
Rept. Mass. State Bd. Health, 1900. 
Rept. Mich. Dairy and Food Comm., 1904. 

Rept. Minn. Dairv and Food Comm., 1901, 
Rept. Conn. Agr. Expt. Sta., Pt. 2, 1901. 

Rept. Mass. State Bd. Health, 1902. 
Rept. Mass. State Bd. Health, 1904. 
Rept. Conn. Agr. Expt. Sta., Pt. 2, 1901, 

Rept. Mass. State Bd. Health, 1902. 
Rept. Mass. State Bd. Health. 1904. 
Rept. Conn. Agr. Expt. Sta.. Pt. 2, 190L 



Rept. Mass. 
Rept. Mass. 
Rept. Mass. 
Rept. Mass. 
Rept. Mich. 
Rept. Mich 
Rept. Conn 

Do. 

Do. 

Do. 

Do. 

Do. 
Rept. Mass. 
Rept. Conn 
Rept. Mass. 
Bull. 13, Pt. 
1887. 



State Bd. Health, 1902. 
State Bd. Health, 1901. 
State Bd. Health, 1903. 
State Bd. Health, 1904. 
Dairy and Food Comm., 1901, 
Dairy and Food Comm.. 1904, 
Agr. Expt. Sta., 1897. 



State Bd. Health, 1900. 
Agr. Expt. Sta.. 1897. 
State Bd. Health. 1900. 
2, Div. Chem., U. S. Dept. Agr., 



MISCELLANEOUS. 



Not specified 

Do 

Do 

Do 

Coal-tar colors 

Deficient in volatile oil 




Rept. Ky. Agr. Expt. Sta., 1900. 
Rept. Minn. Dairv and Food Comm. 
Rept. N.H. State Bd. Health, 1903-4. 

Rept. N. D. Agr. Expt. Sta., 1905. 
Do. 
Do. 



a In black pepper. 



Mn white pepper. 



SUGARS, SIRUPS, ETC. 

As a class the sugars, both high unci low grades, as found on the 
market are practically free from adulteration. Daring recent years, 
however, a product has been put on the market to a limited extent 
which consists of a mixture of cane sugar with starch sugar (glucose) 



38 



POOD ADULTERATION AND METHODS FOR DETECTION. 



and .saccharin, the latter being an artificial sweetening material derived 
from coal tar. There is a popular belief that granulated sugar is often 
adulterated with white sand or pulverized rock, and that pulverized 
sugar is commonly adulterated with starch or lime dust. Cases of 
such adulteration, however, have never been found by this Bureau, 
and it may safely be said that they occur rarely if at all. 

Considering the obvious simplicity of a method of determining the 
presence of such a substance, it is strange that the idea that material 
of this nature commonly occurs in sugar should be as prevalent as it 
is. Sugar is readily soluble in water, and sand and mineral substances 
insoluble. If a spoonful of sugar be placed in a glass of water, there- 
fore, and the mixture stirred, solution will be complete. The sub- 
stances mentioned above, if present, would remain undissolved. Of 
course solution will occur more readily if the water is warm, and care 
must be taken to continue the mixing for a considerable time. A 
sample of granulated or powdered sugar, suspected of being adulter- 
ated with sand or pulverized rock. may. therefore, be readily exam- 
ined by anyone who is interested. 

Table XIV. — Sugar products, sirups, etc. 
CONFECTIONERY. 



Adulterant. 



Extent of adulteration. 



examined! ■Jgjf 





Btarch anil gum 

Organic colon 

Mineral colon 

Grease 

Copper 

Gelatin 

ganic) 

Do 

Artificial flavors 

Iron oxid 

Decomposed peppermint <>il 
Coal-tar dyes 

Do.... -.. 

Sot specified 

Do 

Coal-tar dyes 

Glucose 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Glucose or fane sugar 

GJuci >se and cane sugar 

Do 

Do 

Do 

Do 

Do 

Do 



260 

_ 

8 
17 

56 
31 

28 



Very frequent. 



173 

72 
218 

2 

11 
4 
2 
5 

13 

1 
1 
16 

:• 

2 
14 



Pt. 6, Div. Chem.,U. 8. Dept. Agr., 



Kept. Ohio Dairy and Food Comm.,1895. 
Rept. Ohio Dairy and Food Comm.,1807. 

Rept. Mass. State Bd. Health, 1901. 

Kept. Mass. State Bd. Health, 1902. 

Kept. Minn. Dairv and Food Comm.,1901. 

Kept. X. D. Agr. Expt. Sta., 1902. 

Kept. Ohio Dairy and Food c< .mm., 1901. 

Kept. Ohio Dairv and Food Com m., 1902. 

Kept. X. D. Agr. Expt. Sta., 1905. 



400 


27 


27 


11 




1 


5 


- 


22 


9 


21 


11 




16 


400 


15 


-- 


39 


" 


17 


43 




59 


24 


4 


2 


114 


16 


5 


3 




2 



Bull. 13, Pt. G, Div. Chem.. U. 8. Dept. Agr., 

1892. 
Rept. Mass. State Bd. Health, 1890. 
Kept. Mass. State Bd. Health. 1891. 
Kept. Ohio Dairv and Food Coram., 1898. 
Kept. 111. Dairv and Food Comm.,1900. 
Rept Mich. Dairy and Food Comm.,1900. 
Rept. Minn. Dairv and Food Comm.,1900. 
Bull. 13, Pt. 6, Div. Chem., U. S. Dept. Agr., 

Kept. Mass. State Bd. Health, 1900. 
Kept. Mass. State Bd. Health, 1901. 
Kept. Mass. State Bd. Health. 1902. 
Kept. Mass State Bd. Health, 1903. 
Kept. Mieh. Dairv and Food Comm.,1904. 
Rept. Minn. Dairv and Food Comm.,1903. 
Bull. X. C. State Bd. Agr.. 1902. 
Rept. Ohio Dairv and Food Comm., 1900. 



ADULTERATION OF SUGAR PRODUCTS. 



39 



Table XIV. 



-Sugar products, sirups, etc.— Continued. 
MAPLE PRODUCTS. 



Extent of adulteration. 



No. samples 
examined. 



No. samples 
adulter- 
ated. 



Sugars: 

Cane sugar 

Brown or molasses sugar 

Cane sugar 

Not specified 

Sirups: 

Glucose 

Do 

Do 

Do 

Do 

Do 

Cane sugar 

do : 

Do 

Do 

Do.a 

Glucose and cane sugar . 

< Water -. 

Not specified 

Do 

Do 

Not properly labeleda. . . 



55 
129 
Frequent. 



Kept. Mass. State Bd. Health,- 1890. 
Kept. Mass. State Bd. Health, 1901. 
Kept. Mass. State Bd. Health, 1903. 
Rept. Minn. Dairy and Food Comrn., 1903. 



Bull. 13, Pt. 6, Div. Chern., U. S. Dept, 

1892. 
Rept. Mich. Dairy and Food Comm., 
Rept. Ohio Dairy and Food Comm.. 
Rept. Ohio Dairy and Food Comm., 
Rept. Ohio Dairy and Food Comm.. 

Rept. Ohio Dairy and Food Comm.. 
Rept. Ohio Dairy and Food Comm., 
Rept. Ohio Dairv and Food Comm.. 
Rept. Mass. State Bd. Health, 1903. 
Rept. Mass. State Bd. Health, 1900. 
Rept. Mass. State Bd. Health, 1902. 
Bull. N. C. State Bd. Agr., 1902. 
Rept. Minn. Dairy and Food Comm. 
Rept. Ohio Dairy and Food Comm. 
Rept. Ohio Dairy and Food Comm. 
Rept. N. D. Agr. Expt. Sta., 1905. 



Agr. s 
1900. 



Glucose b 

Do. 6. 
Do. 6. 
Do. 6. 
Do. b. 
Do. 6. 
Do. 6. 
Do... 
Do... 
Do... 
Do.-.. 
Do... 
Do... 
Do... 
Do... 
Do... 
Do... 
Do... 

Tin 

Do... 



17 


10 


« 


4 


20 


13 


m 


12 


8 


1 


281 


25 


384 


66 


411 


15 


41 VI 


8 


93 


22 


145 


13 


107 


4 


1r> 


5 


13 


8 


51 


16 


13 


8 


17 


1 


307 


103 



Bull. 13, Pt, 6, Div. Chem., U. S. Dept, Agr., 

1892. 
Rept. Mass. State Bd. Health, 1890. 
Rept. Ohio Dairy and Food Comm., 1895. 
Rept. Mich. Dairy and Food Comm., 1900. 

Do. 
Rept. Mass. State Bd. Health, 1900. 

Do. 
Rept. Conn. Agr. Expt. Sta., Pt. 2, 1901. 
Rept. Conn. Agr. Expt. Sta,, Pt. 3, 1902. 
Rept. Conn. Agr. Expt. Sta., Pt. 2, 1903. 
Rept. Conn. Agr. Expt. Sta., Pt, 2, 1904, 
Rept, Mass. State Bd. Health, 1901. 
Rept. Mass. State Bd. Health, 1902. 
Rept, Mass. State Bd. Health, 1903. 
Rept, Mich. Dairy and Food Comm., 1904. 
Rept. Minn. Dairy and Food Comm., 1903, 
Rept. N. H. State Bd. Health, 1903-1. 
Rept, Ohio Dairy and Food Comm., 1901. 
Rept. Ohio Dairy and Food Comm., 1895. 
Bull. 13, Pt, 6, Div. Chem., TJ. S. Dept., Agr., 



SIRUPS (TABLE). 



Glucose 

Do 

Do 

Do 

Do.a 

Cane sugar a 
Glucose and 
Not speciiied 



13 




7 


10 




10 


7 




5 


41 




18 


Rare. 




Frequent. 




10 


10 


19 




8 



Rept. Mass. State Bd. Health, 1901. 
Rept. Mich. Dairv and Food Comm., 1901. 
Rept. Mich. Dairy and Food Comm., 1904. 
Rept. Ohio Dairv and Food Comm., 1900. 
Rept, N. D. Agr. Expt. Sta., 1905. 

Do. 
Rept. N. C. State Bd. Agr., 1902. 
Rept. Ohio Dairy and Food Comm., 1902 



i Sirups and sugars. 



bin molasses and sirups. 



40 



FOOD ADULTERATION AND METHODS FOR DETECTION, 



VINEGAR. 

Vinegar in the United States is understood to be the product of the 
acetic fermentation of apple juice without any other addition what- 
ever. In France vinegar is understood to be the product of the acetic 
fermentation of wine. 

Several other classes of vinegar are made in considerable amount. 
Malt vinegar, prepared by the acetic fermentation of an infusion of 
malt, is made in large quantities in the United States and in England. 
Large quantities of distilled vinegar are made by the acetic fermenta- 
tion of alcohol. This product is made in considerable quantity by 
distilleries, and is frequently sold incorrectly as white-wine vinegar. 

The chief frauds practiced in the sale of vinegar are, first, the dilu- 
tion of eider vinegar and wine vinegar; second, the adulteration of 
those vinegars with vinegars of the cheaper sorts, such as distilled 
vinegar; third, the sale of distilled vinegar as cider vinegar or wine 
vinegar, with or without the addition of coloring matter and other 
substances to make it resemble those products. 

Table XV. — Vinegar. 

CIDER VINEGAR. 



Extent of adulteration. 



No. .samples 
examined. 



No. samples 
adulter- 
ated. 



Spirit vinegar and caramel 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Low in acetic acid 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Do 

Artificial products and low in 

acetic acid. 
Low in acetic acid and not prod- 
uct represented. 
Not specified 

Do 

Do 

Do 

spirit vinegar and apple jelly 
solids. 



Frequent. 

Very frequent, 
do. 
do. 

do. 

do. 
do. 

do. 



40 
99 
126 

74 
1,080 
2,977 

68 
105 
270 



23 
63 

59 
55 
183 
1,317 
89 
47 
178 

31 



41.8 per cent 
Very frequent. 



Kept. Ohio Dairv and Food Comm., 1*95. 

Kept. Ohio Dairv and J- I Comm., 1S99. 

Kept. Mich. Dairv and Food Comm., 1900. 
Kept. N. V. Dairy and Food Comm., 189& 
Kept. Minn. Dairv and Food Comm., 1901. 
Kept. Conn. Agr. Expt. Sta., 1897. 
Kept. Bd. Health, Oakland, Cal., 1899. 
Kept. San Francisco Bd. Health, 1897-8. 
Rept. Wis. Dairv and Food Comm., 1893. 
Kept. Conn. Agr. Expt. Sta., Pt.2,1903. 
Kept. Mass. State P.d. Health, 1901. 
Kept. Mass. State Bd. Health, 1903. 
Kept. Ky. Agr. Expt. Sta., 1900. 
Kept. Mich. Dairy and Food Comm., 1904. 
Rept. Minn. Dairy and Food Comm., 1901, 
Kept. Minn. Dairy and Food Comm., 1903. 
Rept, N. H. State Bd. Health, 1903-4. 
Kept. Ohio Dairv and Food Comm.. 1900. 
Kept. Mass. State Bd. Health, 1902. 

Rept, Mich. Dairy and Food Comm., 1901. 

Rept. Ohio Dairv and Food Comm., 1901. 
Kept. Ohio Dairv and Food Comm., 1902. 
Rept. Pa. Dept. Agr., 1900. 

Kept. Mass. State Bd. Health, 1899. 
Rept. Pa. Dept. Agr., 1898. 



MALT VINEGAR. 



Spirit vinegar 

Do 

Do 



Frequent. 

do. 



Rept. Ohio Dairv and Food Coram., 189E 
Rept. San Francisco Bd. Health, 1897-8. 
Kept. 111. State Food Comm., 1900. 





WINE VINEGAB 






Frequent. 

do! 

do. 


Rept, Ohio Dairy and Food Comm., 1897. 
Rept. San Francisco Bd. Health, 1897 - 
Kept. Minn. Dairv and Food Comm., 1901. 
Bull. N. C. State Bd. Agr., 1900. 


Do 


Do 


Do 





METHODS OF ANALYSIS. 41 

SIMPLE TESTS FOR THE DETECTION OF FOOD ADULTERANTS. 
INTRODUCTION. 

Generally speaking, the methods of chemical analysis employed in 
food laboratories can be manipulated only by one who has had at least 
the usual college course in chemistry, and some special training in the 
examination of foods is almost as necessary. Again, most of the 
apparatus and chemicals necessary are entirely beyond the reach of 
the home, and the time consumed by the ordinary examination of a 
food is in itself prohibitive. 

Yet there are some simple tests which serve to point out certain 
forms of adulteration and can be employed by the careful housewife 
with the reagents in her medicine closet and the apparatus in her 
kitchen. The number may be greatly extended by the purchase of a 
very few articles that may be procured for a few cents at any drug 
store. In applying these tests, one general rule must always be kept 
carefully in mind. Every one. whether layman or chemist, must 
familiarize himself with a reaction before drawing any conclusions 
from it. For instance, before testing a sample of supposed coffee for 
starch, the method should be applied to a sample of pure coffee (which 
can always be procured unground) and to a mixture of pure coffee and 
starch prepared by the operator. 

Many manufacturers and dealers in foods have the ordinary senses 
so highly developed that by their aid alone they can form an intelli- 
gent opinion of the nature of a product, or of the character, and 
sometimes even of the proportion, of adulterants present. This is 
especially true of such articles as coffee, wine, salad oils, flavoring 
extracts, butter, and milk. The housewife finds herself constantiy 
submitting her purchases to this test. Her broad experience develops 
her senses of taste and smell to a high degree, and her discrimination 
is often sharper and more accurate than she herself realizes. The 
manufacturer who has developed his natural senses most highly 
appreciates best the assistance or collaboration of the chemist, who 
can often come to his relief when his own powers do not avail. So 
the housewife, by a few simple chemical tests, can broaden her field 
of vision and detect many impurities that are not evident to the senses. 

There are here given methods adapted to this purpose, which may 
be applied to milk, butter, coffee, spices, olive oil, vinegar, jams and 
jellies, and flavoring extracts. In addition to this some general meth- 
ods for the detection of coloring matter and preservatives will be 
given. All of the tests here described may be performed with uten- 
sils found in any well-appointed kitchen. It will be convenient, how- 
ever, to secure a small glass funnel, about 3 inches in diameter, since 
filtration is directed in a number of the method- prescribed. Filter 
paper can best be prepared for the funnel by cutting a circular piece 



42 FOOD ADULTERATION AND METHODS FOR DETECTION. 

about the proper size and folding it once through the middle and then 
again at right angles to the first fold. The paper may then be opened 
without unfolding in such a way that three thicknesses lie together on 
one side and only one thickness on the other. In this way the paper 
may be made to tit nicely into the funnel. 

Some additional apparatus, such as test tubes, racks for supporting 
them, and glass rods, will be found more convenient for one who 
desires to do considerable work on this subject, but can be dispensed 
with. The most convenient size for test tubes is a diameter of from 
one-half to live-eighths inch and a length of from 5 to 6 inches. A 
graduated cylinder will also be found very convenient. If this is 
graduated according to the metric s} 7 stem, a cylinder containing about 
100 cc will be found to be convenient; if the English liquid measure 
is used it may be graduated to from 3 to 8 ounces. 

CHEMICAL REAGENTS. 

The word "reagent" is applied to "any substance used to effect 
chemical change in another substance for the purpose of identifying 
its component parts or determining its percentage composition." The 
following reagents are required in the methods here given: 

Turmeric paper. 

Iron alum (crystal or powdered form). 

Hydrochloric acid (muriatic acid) concentrated. 

Caution. — Ml tests in which hydrochloric acid is used should he conducted in glass or 
earthen ware, for this acid attacks and urill injure metallic vessels, such as iron, tin, :i)ic, 
etc. Care must also be taken not i<> bring it into contact with the flesh or clothes. If by 
accident a drop if it falls upon, the clothes, ammonia, or in its absence a solution of saleratus 
or so! soda i washing soda), in water, should be applied promptly. 

lodin. tincture. 

Potassium permanganate, 1 per cent solution. 

Alcohol (grain alcohol). 

Chloroform. 

Boric acid or borax. 

Ammonia water. 

Halphen's reagent. 

With the exception of the last reagent mentioned, these substances 
ma}' be obtained in any pharmacy. The Halphen reagent should be 
prepared by a druggist rather than by an inexperienced person who 
desires to use it. This is especially important because of the inflam- 
mable nature of carbon bisulphid which enters into its composition. 

Caution. — Carbon bisulphid is a very inflammable substance and is at least as danger- 
ous to handle as gasoline. ■ For this reason the Halphen reagent, into the composition of 
which carbon bisulphid enters, must be handled with care, and only a small portion of it 
taken into the ricinity of the fire. Mhen it is employed the end of the test tube may be 
loosely stoppered with cotton. The carbon bisulpJtid in tlte amount of reagent used for a 
single test, however, is so small as not to cause any particular danger in its use. 



PRESERVATIVES. 43 

Halphen's reagent is prepared as follows: An approximately 1 per 
rent solution of sulphur is made by dissolving about one-third of a 
teaspoonful of precipitated sulphur in 3 or 4 ounces of carbon bisul- 
phid. This solution mixed with an equal volume of amyl alcohol 
forms the reagent required by the method. A smaller quantity than 
that indicated by these directions may of course be prepared. 

If turmeric paper be not available it may be made as follows: Place 
a bit of turmeric powder (obtainable at any drug store) in alcohol, 
allow it to stand for a few minutes, stir, allow it to stand again until 
it settles, dip a strip of filter paper into the solution, and dry it. 

DETERMINATION OF PRESERVATIVES. 

The following methods cover all of the more important commercial 
preservatives with the exception of sulphites and fluorids. These are 
quite frequently used for preserving foods — the former with meat 
products and the latter with fruit products — but. unfortunately, the 
methods for their detection are not suitable for household use. 

DETECTION OF SALICYLIC ACID. 

The determination of salicylic acid can best be made with liquids. 
Solid and semi-solid foods, such as jelly, should be dissolved, when 
soluble, in sufficient water to make them thinly liquid. Foods con- 
taining insoluble matter, such as jam, marmalade, and sausage, may 
be macerated with water and strained through a piece of white cotton 
cloth. The maceration may be performed by rubbing in a teacup or 
other convenient vessel with a heavy spoon. 

Salicylic acid is used for preserving fruit products of all kinds, 
including beverages. It is frequently sold by drug stores as fruit 
acid. Preserving powders consisting' entirely of salicylic acid are 
often carried from house to house by agents. It may be detected as 
follows: 

Between 2 and 3 ounces of the liquid obtained from the fruit prod- 
ucts, as described above, are placed in a narrow bottle holding 5 ounces, 
about a quarter of a teaspoonful of cream of tartar (or. better, a few 
drops of sulphuric acid) is added, the mixture shaken for two or three 
minutes, and filtered into a second small bottle. Three or four table- 
spoonfuls of chloroform are added to the clear liquid in the second 
bottle and the liquids mixed by a somewhat vigorous rotary motion, 
poured into an ordinary glass tumbler, and allowed to stand till the 
chloroform settles out in the bottom. Shaking is avoided, as it causes 
an emulsion which is difficult to break up. As much as possible of 
the chloroform layer (which now contains the salicylic acid ) n removed 
(without any admixture of the aqueous liquid) by means of a medicine 
dropper and placed in a test tube or small bottle with about an equal 



44 FOOD ADULTERATION AND METHODS FOR DETECTION. 

amount of water and a small fragment — a little larger than a pinhead — 
of iron alum. The mixture is thoroughly shaken and allowed to stand 
till the chloroform again settles to the bottom. The presence of 
salicylic acid is then indicated by the purple color of the upper layer 
of liquid. 

DETECTION OF BENZOIC ACID. 

Benzoic acid also is used for preserving fruit products. Extract 
the sample with chloroform as in the case of salicylic acid; remove the 
chloroform layer and place it in a white saucer, or, better, in a plain 
glass sauce dish. Set a basin of water— as warm as the hand can 
bear on the outside window ledge and place the dish containing the 
chloroform extract in it, closing the window until the chloroform has 
completely evaporated. In this manner the operation maj r be con- 
duct. <1 with >afety even by one who is not accustomed to handling 
chloroform. In warm weather the vessel of warm water may, of 
coarse, be omitted. Benzoic acid, if present in considerable amount, 
will now appear in the dish in characteristic flat crystals. On warm- 
ing the dish the unmistakable irritating odor of benzoic acid may be 
obtained. This method will detect benzoic acid in tomato catsup or 
other articles in which it is used in large quantities. It is not suffi- 
cient ly delicate, however, for the smaller amount used with some 
articles, such as wine. It is often convenient to extract a larger 
quantity of the sample and divide the chloroform layer into two 
portions, testing one for salic3 7 lie acid and the other for benzoic acid. 

DETECTION OK BORIC ACID AND BORAX. 

Boric acid (also called boracic acid) and its compound with sodium 
(borax) are often used to preserve animal products, such as sausage, 
butter, and sometimes milk. For the detection of boric acid and 
borax, solids should be macerated with a small amount of water and 
strained through a white cotton cloth. The liquid obtained by treat- 
ing solids in this manner is clarified somewhat b} r thoroughly chilling 
and filtering through filter paper. 

In testing butter place a heaping. teaspoonful of the sample in a tea- 
cup, add a couple of teaspoonfuls of hot water, and stand the cup in a 
vessel containing a little hot water until the butter is thoroughly 
melted. Mix the contents of the cup well b} T stirring with a teaspoon 
and set the cup with the spoon in it in a cold place until the butter is 
solid. The spoon with the butter (which adheres to it) is now removed 
from the cup and the turbid liquid remaining strained through a white 
cotton cloth, or better, through filter paper. The liquid will not all 
pass through the cloth or filter paper, but a sufficient amount for the 
test may be secured readily. 

In testing milk for boric acid 2 or 3 tablespoonfuls of milk are 
placed in a bottle with twice that amount of a solution of a teaspoonful 



ARTIFICIAL COLORS. 45 

of alum in a pint of water, shaken vigorously, and filtered through 
filter paper. Here again a clear or only slightly turbid liquid passes 
through the paper. 

About a teaspoonf ul of the liquid obtained by any one of the methods 
mentioned above is placed in any dish, not metal, and 5 drops of hydro- 
chloric (muriatic) acid added. A strip of turmeric paper is now dipped 
into the liquid and then held in a warm place — near a stove or lamp- 
till dry. If boric acid or borax was present in the sample the turmeric 
paper becomes bright cherry red when dry. A drop of household 
ammonia changes the red color to dark green or greenish black. If 
too much hydrochloric acid is used the turmeric paper may take on a 
brownish red color even in the absence of boric acid. In this case, 
however, ammonia changes the color to brown just as it does turmeric 
paper which has not been dipped into the acid solution. 

DETECTION OF FORMALDEHYDE. 

Formaldehyde is rarely used with other foods than milk. The 
method for its detection in milk is given on page 52. For its detec- 
tion in other foods it is usually necessary to first separate it by distil- 
lation, a process which is scarcely available for the average person 
without laboratory training and special apparatus. For this reason 
no method is suggested here for the detection of formaldehyde in 
other foods than milk. 

DETECTION OF SACCHARIN. 

Saccharin has a certain preservative power, but it is used not so 
much for this effect as because of the very sweet taste which it imparts. 
It is extracted by means of chloroform, as described under the detec- 
tion of salicjdic acid (p. 43). In the case of solid and semisolid foods, 
the sample must, of course, be prepared by extraction with water, as 
described under salicylic acid. The residue left after the evaporation 
of the chloroform, if a considerable amount of saccharin is present. 
has a distincth T sweet taste. 

The only other substance having a sweet taste which may be present 
in foods, i. e., sugar, is not soluble in chloroform, and therefore does 
not interfere with this reaction. Certain other bodies (tannins) which 
have an astringent taste are present, and as they are soluble in chloro- 
form may sometimes mask the test for saccharin, but with practice 
this difficulty is obviated. 

DETERMINATION OF ARTIFICIAL COLORS. 

DETECTION OF COAL-TAR DYES. 

As has been stated, coloring matters used with foods are usually 
soluble in water. If the food under examination be a liquid, it may 
therefore be treated directly by the method given below. If it be a 



46 FOOD ADULTERATION AND METHODS FOR DETECTION. 

solid or a pasty substance, soluble in water either in the cold or after 
heating, it may be dissolved in sufficient water to form a thin liquid. 
If it contains some insoluble material, it may be treated with sufficient 
water to dissolve the soluble portion with the formation of a thin 
liquid and filtered, and then strained through a clean white cotton 
cloth to separate the insoluble portion. About a half teacupful of 
the liquid thus described is heated to boiling, after adding a few drops 
of hydrochloric acid and a small piece of Avhite woolen cloth or a few 
strands of white woolen yarn. (Before using, the wool should be boiled 
with water containing a little soda, to remove any fat it may contain, 
and then washed with water.) The wool is again washed, first with 
hot and then with cold water, the water pressed out as completely as 
possible, and the color of the fabric noted. If no marked color is pro- 
duced, the test may be discontinued and the^ product considered free 
from artificial colors. If the fabric is colored, it may have taken up 
coal-tar colors, some foreign vegetable colors, and if a fruit product 
i> being examined, some of the natural coloring matter of the fruit. 
Etmse the fabric in hot water, and then boil for two or three minutes 
in about one-third of a teacupful of water and two or three teaspoon- 
fula of household ammonia. Remove and free from as much of the 
liquid a- possible* by squeezing or wringing. Usually the fabric wifl 
retain the greater part of the natural fruit color, while the coal-tar 
color dissolves in dilute ammonia. The liquid is then stirred with a 
splinter of wood and hydrochloric acid added, a drop or two at a time, 
until there is no longer any odor of ammonia. (The atmosphere of the 
vessel is sometimes charged with the ammonia for several minutes after 
it has all been driven out of the liquid; therefore one should blow into 
the dish to remove this air before deciding whether the ammonia odor 
baa been removed or not.) When enough acid has been added the 
liquid has a xmr taste, a- may be determined by touching the splinter, 
used in stirring, to the tongue. 

A fresh piece of white woolen cloth is boiled in this liquid and 
thoroughly washed. If this piece of cloth has a distinct color the food 
under examination is artificially colored. The color used may have 
been a coal-tar derivative, commonly called an anilin dye, or an arti- 
ficial color chemically prepared from some vegetable color. If of the 
first class the dyed fabric is usually turned purple or blue by ammonia. 
In either case if the second fabric has a distinct color it is evident that 
the product under examination is artificially colored. Of course a 
dull, faint tint must be disregarded. 

DETECTION OF COPPER. 

The presence of copper, often used to deepen the green tint of 

imported canned peas, beans, spinach, etc., may be detected as follows: 

Mash some of the sample in a dish with a stiff kitchen spoon. Place 



ARTIFICIAL COLORS. 47 

a teaspoonf ul of the pulp in a teacup with three teaspoonfuls of water 
and add 30 drops of strong hydrochloric acid with a medicine dropper. 
Set the cup on the stove in a saucepan containing boiling water. Drop 
a bright iron brad or nail (wire nails are the best and tin carpet tacks 
will not answer the purpose) into the cup and keep the water in the 
saucepan boiling for twent} 7 minutes, stirring the contents of the cup 
frequently with a splinter of wood. Pour out the contents of the cup 
and examine the nail. If present in an appreciable amount the nail 
will be heavily plated with copper. 

Caution. — Be careful not to allow the hydrochloric acid to come in contact with metals 
or with the flesh or clothing. 

DETECTION OF TURMERIC. 

In yellow spices, especially mustard and mace, turmeric is often 
employed. This is especially true of prepared mustard to which a 
sufficient amount of starch adulterant has been added to materially 
reduce the natural color. If turmeric be employed to restore the 
normal shade an indication of that fact may sometimes be obtained by 
mixing a half teaspoonful of the sample in a white china dish and 
mixing with it an equal amount of water, and a few drops (4 to 10) of 
household ammonia, when a marked brown color, which does not 
appear in the absence of turmeric, is formed. At the present time 
turmeric or a solution of curcuma (the coloring matter of turnierjc) is 
sometimes added to adulterated mustard in sufficient amount to materi- 
ally increase its color, but not to a sufficient extent to give the brown 
appearance with ammonia described above. In such cases a teaspoon- 
ful of the suspected sample may be thoroughly stirred with a couple 
of tablespoonfuls of alcohol, the mixture allowed to settle for fifteen 
minutes or more and the upper liquid poured off into a clean glass or 
bottle. To about 1 tablespoonful of the liquid thus prepared and 
placed in a small clear dish (a glass salt cellar serves excellently) add 
4 or 5 drops of a concentrated solution of boric acid or borax and 
about 10 drops of hydrochloric acid/' and mix the solution by stirring 
with a splinter of wood. A wedge-shaped strip of filter paper about 
2 or 3 inches long, 1 inch wide at the upper end, and one-fourth inch 
at the lower end is then suspended by pinning, so that its narrow end 
is immersed in the solution, and is allowed to stand for a couple of 
hours. The best results are obtained if the paper is so suspended that 
air can circulate freely around it, i. e., not allowing it to touch any- 
thing except the pin and the liquid in the dish. If turmeric be pres- 
ent a cherry red color forms on the filter paper a short distance below 
the upper limit to which the liquid is absorbed by the paper, frequently 
from three-fourths of an inch to an inch above the surface of the 

"Caution: iSee page 52. 



48 FOOD ADULTERATION AND METHODS FOR DETECTION. 

liquid itself. A drop of household ammonia changes this red color to 
a dark green, almost black. If too much hydrochloric acid is used a 
dirty brownish color is produced. 

DETECTION OF CARAMEL. 

A solution of caramel is used to color many substances, such as vin- 
egar and some distilled liquors. To detect it two test tubes or small 
bottles of about equal size and shape should be employed and an equal 
amount (2 or 3 tablespoonfuls or more) of the suspected sample placed 
in each. To one of these bottles is added a teaspoonful of fullers' 
earth, the sample shaken vigorously for two or three minutes and 
then filtered through filter paper, the first portion of the filtered liquid 
being returned to the filter paper and the sample finally collected into 
tin- test lube or bottle in which it was originally placed, or a similar 
one. The filtered liquid i^ now compared with the untreated sample. 
If it is markedly lighter in color it may be taken for granted that the 
color of the liquid is due to caramel, which is largely removed by 
fullers' earth. In applying this test, however, it must be borne in 
mind that caramel occurs naturally in malt vinegar, being formed in 
i he preparation of the malt. It is evident that the tests require prac- 
tice and experience before they Can be successfully performed. The 
housewife can use them, but must repeat them frequently in order to 
become proficient in their use. 

EXAMINATION OF CERTAIN CLASSES OF FOODS. 
CANNED VEi; ETA B LES. 

A- before stated, canned vegetables are relatively free from adul- 
teration by means of foreign subitances. The different grades of 
products may with care be readily detected by the general appearance 
of the sample. The purchaser is, of course, at the disadvantage of 
not being able to see the product until the can is opened. By a study 
of the different brands available in the vicinity, however, he can read- 
ily Belect those which are preferable. As stated in an earlier part of 
the bulletin, canned tomatoes sometimes contain an artificial coloi'ing 
matter, which may be detected as described on page 45. 

(aimed sweet corn is sometimes sweetened with saccharin, which 
may be detected as described on page 45. 

It is believed that as a rule canned vegetables are free from pre- 
servatives, although some instances of chemical preservation have 
recently been reported in North Dakota, and some imported tomatoes 
have been found by this Bureau to be artificially preserved. The 
presence of copper, often used for the artificial greening of imported 
canned peas, beans, spinach, etc., may be detected as described on 
page 46. 



EXAMINATION" OF COFFEE. 49 



There are a number of simple tests for the presence of the adulter- 
ants of ground coffee. These tests are called simple because they can 
be performed without the facilities of the chemical laboratory, and by 
one who has not had the experience and training of a chemist. It must 
be understood, however, that they require careful observation and 
study, and that one must perform them repeatedly in order to obtain 
reliable results. Before applying them to the examination of an 
unknown sample, samples of known character should be secured and 
studied. Unground coffee may be ground in the home and mixed with 
various kinds of adulterants, which can also be secured separately. 
Thus the articles themselves in known mixtures may be studied and 
when the same results are obtained with unknown samples they can be 
correctly interpreted. Thes* 1 tests are well known in the laboratory 
and may be used in the home of the careful housewife who has the 
time and perseverance to master them. 

PHYSICAL TESTS. 

The difference between the genuine ground coffee and the adulter- 
ated article can often be detected by simple inspection with the naked 
eye. This is particularly true if the product be coarsely crushed rather 
than finery ground. In such condition pure coffee has a quite uniform 
appearance, whereas the mixtures of peas, beans, cereals, chicoiy, etc., 
often disclose their heterogeneous nature to the careful observer. This 
is particularly true if a magnifying glass be emplo}~ed. The different 
articles composing the mixture may then be separated b} T the point of 
a penknife. The dark, gummy-looking chicory particles stand out in 
strong contrast to the other substances used, and their nature can be 
determined by one who is familiar with them by their astringent taste. 

The appearance of the coffee particles is also quite distinct from that 
of many of the coffee substitutes employed. The coffee has a dull sur- 
face, whereas some of its substitutes, especially leguminous products, 
often present the appearance of having a polished surface. 

After a careful inspection of .the sample with the naked eye, or, bet- 
ter, with a magnifying glass, a portion of it may be placed in a small 
bottle half full of water and shaken. The bottle is then placed on the 
table for a moment. Pure coffee contains a large amount of oil, by 
reason of which the greater portion of the sample will float. All cof- 
fee substitutes and some particles of coffee sink to the bottom of the 
liquid. A fair idea of the purit} T of the sample can often be deter- 
mined by the proportion of the sample which floats or sinks. 

Chicory contains a substance which dissolves in water, imparting a 
brownish-red color. When the suspected sample, therefore, is dropped 
into a glass of water, the grains of chicory which it contains may be 



50 FOOD ADULTERATION AND METHODS FOR DETECTION. 

BeeD Blowly sinking to the bottom, leaving a train of a dark-brown col- 
ored liquid behind them. This test appears to lead to more errors in 
the hands of inexperienced operators than any other test here given. 
Wrong conclusions may be avoided by working first with known 
samples of coffee and chicory as suggested above. 

Many coffee substitutes are now sold as such and are advertised as 
more wholesome than coffee. Notwithstanding the claims that are made 
for them, a few of them contain a considerable percentage of coffee. 
This may be determined by shaking a teaspoon ful in a bottle half full 
Of water, as described above. The bottle must be thoroughly shaken 
bo as to wet every particle of the sample. Very few particles of coffee 
Bubsititates will float. 

CHEMICAL 

Coffee contains no starch, while all of the substances, except chic- 
ory, used for its adulteration and in the preparation of coffee substi- 
tutes contain a considerable amount of starch. The presence of such 
substitutes may. therefore, be detected by applying the test for starch 
as given on page 58. In making this test less than a quarter of a tea- 
spoonful of ground coffee should be used, or a portion of the ordinary 
infusion prepared for the table may be employed after dilution. The 
amount of water that should be added can only be determined by 
experience. 

(<>M>I MENTAL SAUCES. 

Tomato catsup and other condimental sauces are frequentl}* pre- 
ierved and colored artificially. The preservatives employed are usually 
salicylic acid and benzoic acid or their sodium salts. These products 
may be detected by the methods given on pages 43 and 44. 

Coal-tar colors are frequently employed with this class of goods, 
especially with those of a reddish tint, like tomato catsup. They may 
be detected by the methods given on page 45. 

DAIRY PRODUCTS. 



Methods are available which, with a little practice, may be employed 
to distinguish between fresh butter, renovated or process butter, and 
oleomargarin. 

These methods are commonly used in food and dairy laboratories, 
and were originally suggested as household tests. a They give reliable 
results. At the same time considerable practice is necessary before we 
• an interpret correctl\- the results obtained. Some process butters are 
on the market which can be distinguished from fresh butter only with 

«■ Patrick, Household tests for the detection of oleomargarin and renovated butter, 
Farmers' Bulletin No. 131. 



EXAMINATION OF DAIEY PKODUCTS. 51 

extreme difficulty. During the last few years considerable progress 
has been made in the attempt to renovate butter in such a way that it 
will appear like fresh butter in all respects. A study must be made 
of these methods if we would obtain reliable results. 

The "spoon" test has been suggested as a household test, and is 
commonly used by analytical chemists for distinguishing fresh butter 
from renovated butter and oleomargarin. A lump of butter two or 
three times the size of a pea is placed in a large spoon and heated over 
an alcohol or Bunsen burner. If more convenient, the spoon may be 
held above the chimney of an ordinary kerosene lamp, or it may even 
be held over an ordinary illuminating gas burner. If the sample in 
question be fresh butter it will boil quietly, with the evolution of 
many small bubbles throughout the mass which produce a large amount 
of foam. Oleomargarin and process butter, on the other hand, sput- 
ter and crackle, making a noise similar to that heard when a green stick 
is placed in a fire. Another point of distinction is noted if a small por- 
tion of the sample be placed in a small bottle and set in a vessel of 
water sufficiently warm to melt the butter. The sample is kept melted 
from half an hour to an hour, when it is examined. If renovated but- 
ter or oleomargarin, the fat will be turbid, while if genuine fresh but- 
ter the fat will almost certainly be entirely clear. 

To manipulate what is known as the "Waterhouse" or "milk" test, 
about 2 ounces of sweet milk are placed in a wide-mouthed bottle, which 
is set in a vessel of boiling water. When the milk is thoroughly 
heated, a teaspoonful of butter is added, and the mixture stirred with 
a splinter of wood until the fat is melted. The bottle is then placed in 
a dish of ice water and the stirring continued until the fat solidities. 
Now, if the sample be butter, either fresh or renovated, it will be solid- 
ified in a granular condition and distributed through the milk in small 
particles. If, on the other hand, the sample consist of oleomargarin it 
solidifies practically in one piece and may be lifted by the stirrer from 
the milk. 

By these two tests, the first of which distinguishes fresh butter from 
process or renovated butter and oleomargarin, and the second of which 
distinguishes oleomargarin from either fresh butter or renovated but- 
ter, the nature of the sample under examination may be determined. 



The oldest and simplest method of adulterating milk is by dilution 
with water. This destroys the natural yellowish-white color and pro- 
duces a bluish tint, which is sometimes corrected by the addition of 
a small amount of coloring matter. 

Another form of adulteration is the removal of the cream and the 
sale as whole milk of skimmed or partially skimmed milk. Again. 



52 FOOD ADULTERATION AND METHODS FOR DETECTION. 

the difficulty experienced in the preservation of milk in warm weather 
has led to the widespread use of chemical preservatives. 

Detection of water. — If a lactometer or hydrometer, which can be 
obtained of dealers in chemical apparatus, be available, the specific 
gravity of milk will afford some clew as to whether the sample has 
been adulterated by dilution with water. Whole milk has a specific 
gravity between 1.027 and 1.033. The specific gravit} T of skimmed 
milk is higher, and milk very rich in cream is sometimes lower than 
these figures. It is understood, of course, that by specific gravity is 
meant the weight of a substance with reference to the weight of an 
equal volume of water. The specific gravity of water, therefore, is 
exactly 1. It is obvious that if water be added to a milk with the 
specific gravity of 1.030, the specific gravity of the mixture will be 
somewhat below those figures. 

An indication b}^ means of a hydrometer or lactometer below the 
figure 1.027 therefore indicates either that the sample in question is a 
very rich milk or that it is a milk (perhaps normal, perhaps skimmed) 
that has been watered. The difference in appearance and nature of 
these two extremes is sufficiently obvious to make useof the lactometer 
or hydrometer of value as a preliminary test of the purity of milk. 

Detection of color. — As previously stated, when milk is diluted by 
means of water the natural yellowish-white color is changed to a bluish 
tint, which is sometimes corrected by the addition of coloring matter. 
Coal-tar colors are usually employed for this purpose. A reaction for 
these colors is often obtained in the method given below for the detec- 
tion of formaldehyde. When strong hydrochloric acid is added to 
the milk in approximately equal proportions before the mixture is 
heated a pink' tinge sometimes is evident if a coal-tar color has been 
added. 

Detection of formaldehyde. — Formaldehyde is the substance most 
commonly used for preserving milk and is rarely, if ever, added to 
any other food. Its use is inexcusable and especially objectionable in 
milk served to infants and invalids. 

To detect forinaldetryde in milk 3 or 1 tablespoonfuls of the sample 
are placed in a teacup with at least an equal amount of strong hydro- 
chloric acid and a piece of ferric alum about as large as a pinhead, 
the liquids being mixed by a gentle rotary motion. The cup is then 
placed in a vessel of boiling water, no further heat being applied, and 
left for five minutes. At the end of this time, if formaldefryde be 
present, the mixture will be distinctly purple. If too much heat is 
applied, a muddy appearance is imparted to the contents of the cup. 

Caution. — Great care must be exercised in working with hydrochloric acid, as it is 
strongly corrosiie. It must not come in contact urith the flesh or clotltes of the operator nor 
with any metallic vessels and must be greatly diluted with water before it is poured into the 
sink. 



EXAMINATION OF OILS. 53 

EDIBLE OILS. 

DETECTION OF COTTON-SEED OIL. 

With the exception of cotton-seed oil, the adulterants ordinarily used 
with edible oils are of such a nature that the experience and training 
of a chemist and the facilities of a chemical laboratory are essential to 
their detection. There is, however, a simple test for the detection of 
cotton-seed oil, known as the Halphen test, which may be readily 
applied. 

The reader is cautioned that great care must be taken in the manipu- 
lation of this test, as one of the reagents employed — carbon bisulphid — 
is very inflammable. The manipulator should use every possible safe- 
guard and should see to it that onty a small portion of his reagent is 
exposed at one time/' The chemicals employed in the preparation of 
the reagent used for this test are not household articles. They may, 
however, be obtained in any pharmacy. The mixture should be pre- 
pared by a druggist rather than by an inexperienced person who desires 
to use it. (See p. 42.) 

In order to perform the test 2 or 3 tablespoonfuls of this reagent 
are mixed in a bottle with an equal volume of the suspected sample of 
oil and heated in a vessel of boiling salt solution (prepared hy dissolv- 
ing 1 tablespoonf ul of salt in a pint of water) for ten or fifteen minutes. 
At the end of that time, if even a small percentage of cotton-seed oil 
be present, the mixture will be of a distinct reddish color, and if the 
sample consists largely or entirely of cotton-seed oil, the color will be 
deep red. 

EGGS. 

There is no better method for the testing of the freshness of an egg 
than the familiar one of "candling," which has long been practiced by 
dealers. The room is darkened and the egg held between the eye and 
a light; the presence of dark spots indicates that the egg is not per- 
fectly fresh, one that is fresh presenting a homogeneous, translucent 
appearance. Moreover, there is found in the larger end of a fresh 
egg, between the shell and the lining membrane, a small air cell which, 
of course, is distinctly transparent. In an egg which is not perfectly 
fresh this space is filled and hence presents the same appearance as 
the rest of the egg. 

It is now a matter of considerable importance to be able to distin- 
guish between fresh eggs and those that have been packed for a consid- 
erable time. Until recently that was not a difficult matter. All of 
the solutions that were formerly used extensively for that purpose 
gave the shell a smooth, glistening appearance which is not found in 
the fresh egg. This characteristic, however, is of less value now than 

«See Caution, p. 42. 



54 FOOD ADULTERATION AND METHODS FOR DETECTION. 

formerly, owing to the fact that packed eggs are usually preserved in 
cold storage. There is now no means hy which a fresh egg can be 
distinguished from a packed egg without breaking it. Usually in eggs 
that have been packed for a considerable time the white and yolk 
slightly intermingle along the point of contact, and it is a difficult 
matter to separate them. Packed eggs also have a tendency to adhere 
to the shell on one side and when opened frequently have a musty 
odor. 

FLAVORING EXTRACTS. 

Although quite a large number of flavoring extracts are on the 
market, vanilla and lemon extracts are used so much more commonly 
than other flavors that a knowledge of their purity is of the greatest 
importance. Only methods for the examination of those two products 
will, therefore, be considered. 

VANILLA EXTRACT. 

Vanilla extract is made by extracting vanilla beans with alcohol. It 
consists of an alcoholic solution of vanillin (the characteristic flavor- 
ing matter of the vanilla bean) and several other products, chiefly 
resins, which, though present in but small amount and having only a 
slight flavor in themselves, yet affect very materially the flavor of the 
product. Vanilla extract is sometimes adulterated with the extract of 
the tonka bean. This extract to a certain extent resembles vanilla 
extract. The extract of the tonka beau, however, is far inferior to 
that of the vanilla bean. It has a relatively penetrating, almost pun- 
gent odor, standing in sharp contrast to the flavor of the vanilla 
extract. This odor is so different that one who has given the matter 
some attention ma}' readily distinguish the two, and the quality of the 
vanilla extract may often be judged with a fair degree of accuracy by 
means of the odor alone. 

Another form of adulteration and one that is now quite prevalent is 
the use of artificial vanillin in place of the extract of either vanilla or 
tonka beans. Artificial vanillin has, of course, the same composition 
and characteristics as the natural vanillin of the vanilla bean. Extracts 
made from it, however, are deficient in the resins and other products 
which are just as essential to the true vanilla as is vanillin itself. 
Since vanillin is thus obtained from another source so readily, methods 
for the determination of the purity of vanilla extract must depend 
upon the presence of other substances than vanillin. 

Detection of caramel. — The coloring matter of vanilla extract is due 
to substances naturally present in the vanilla bean and extracted there- 
from by alcohol. Artificial extracts made by dissolving artificial 
vanillin in alcohol contain no color of themselves, and to supply it 
caramel is commonly employed. Caramel ma}' be detected in arti- 



EXAMINATION OF EXTRACTS. 55 

ficial extracts by shaking and observing the color of the resulting foam 
after a moment's standing. The foam of pure extracts is colorless. 
If caramel is present a color persists at the points of contact between 
the bubbles until the last bubble has disappeared. The test with 
fullers' earth given for caramel in vinegar (p. 48) is also very satis- 
factory, but of course requires the loss of the sample used for the test. 

Examination of the resin. — If pure vanilla extract be evaporated to 
about one-third its volume the resins become insoluble and settle to the 
bottom of the dish. Artificial extracts remain clear under the same 
conditions. In examining vanilla extract the character of these resins 
is studied. For this purpose a dish containing about an ounce of the 
extract is placed on a teakettle or other vessel of boiling water until 
the liquid evaporates to about one-third or less of its volume. O wing- 
to the evaporation of the alcohol the resins will then be insoluble. 
Water ma} r be added to restore the liquid to approximately its original 
volume. The resin will then separate out as a brown flocculent pre- 
cipitate. A few drops of h} T drochloric acid may be added and the 
liquid stirred and the insoluble matter allowed to settle. It is then 
filtered and the resin on the filter paper washed with water. The resin 
is then dissolved in a little alcohol, and to one portion of this solution 
is added a small particle of ferric alum and to another portion a few 
drops of hydrochloric acid. If the resin be that of the vanilla bean, 
neither ferric alum nor Irydrochloric acid will produce more than 
a slight change of color. With resins from most other sources, how- 
ever, one or both of these substances yield a distinct color change. 

For filtering, a piece of filter paper should be folded once through 
the middle, and again at right angles to the first fold. It may now be 
opened with one fold on one side and three on the other and fitted into 
a glass funnel. When the paper is folded in this manner the precipi- 
tated resins may be readily washed with water. When the washing is 
completed the resins may be dissolved by pouring alcohol through the 
filter. This work with the resins will require some practice before it 
can be successfully performed. It is of considerable value, however, 
in judging of the purity of vanilla extract. 

LEMON EXTRACT. 

By lemon extract is understood a solution of lemon oil in strong 
alcohol. In order to contain as much lemon oil as is supposed to be 
found in high-grade extracts the alcohol should constitute about 80 
per cent of the sample. The alcohol is therefore the most valuable 
constituent of lemon extract, and manufacturers who turn out a 
low-grade product usually do so because of their economy of alcohol 
rather than of lemon oil. Owing to the fact that lemon extract is 
practically a saturated solution of oil of lemon in strong alcohol the 
sample may be examined by simple dilution with water. A teaspoon- 



56 FOOD ADULTERATION AND METHODS FOR DETECTION. 

f ul of the oil in question may be placed in the bottom of an ordinary 
glass tumbler and 2 or 3 teaspoonfuls of water added. If the sample 
in question be real lemon extract the lemon oil should be thrown out 
of solution by reason of its insolubility in the alcohol after its dilution 
with water. The result is at first a marked turbidity and later the 
separation of the oil of lemon on the top of the aqueous liquid. If the 
sample remains perfectly clear after the addition of water, or if a 
marked turbidity is not produced, it is a low-grade product and con- 
tains very little, if any, oil of lemon. 



Within the last decade a process for artificially bleaching flour has 
been quite widely introduced. A bleached flour is of a dead white 
color and the loaf of bread baked therefrom is usually a dingy white 
and not what would be expected from the color of the flour. The 
bleaching process results in the addition of small amounts of nitrogen 
peroxid to the flour and renders the oil present nearly colorless 
instead of yellow. On these two facts the following tests are based: 

TESTS FOR BLEACHING. 

Method I. (For nitrites.) 

Solutions. — (1) Dissolve 0.5 gram (7.7 grains) of sulphanilic acid in 
150 cc (5 fluid ounces) of dilute acetic acid (about 20 per cent). Keep well 
stoppered. (2) Dissolve 0.2 gram (3.1 grains) of alpha-naphthylamin 
hydrochlorid in 20 cc (0.7 fluid ounce) of strong acetic acid (glacial), 
and add 130 cc (1.1 fluid ounces) of dilute acetic acid (20 per cent). 
Keep well stoppered. Mix solutions 1 and 2 for use. The mixed 
reagent keeps for several weeks, and possibly much longer. 

Preliminary test. — The water to be used should first be tested for 
nitrites by adding to a 4-ounce bottle of water about 1 teaspoonf ul 
of the mixed reagent. If after shaking and allowing to stand for 
about twenty minutes the solution remains colorless or is a very faint 
pink color, the water is suitable for making the following test. Dis- 
tilled water is best for this purpose, if obtainable. 

Determination. — Place a heaping teaspoonful of the flour to be 
examined in a wide-mouth, glass-stoppered, 4-ounce bottle. Nearly 
fill with water and add about a teaspoonful of the solution. Stopper 
the bottle and shake vigorously for a few minutes, then allow to settle 
for from fifteen to twenty minutes. 

Under these conditions bleached flour will impart to the liquid a 
color ranging from a light pink to a deep red, depending on the degree 
of bleaching. Unbleached flour should give no more color than the 
water alone. If a flour that is known to be unbleached can be obtained, 



EXAMINATION OF FRUIT PRODUCTS. I 

it is well to make the test on this at the same time for purposes of 
comparison. 

Method II. {For color of oil.) < 

Place 2 heaping teaspoonfuls (20 grams) of the flour in a wide-mouth, 
glass-stoppered, -i-ounce bottle, nearly fill the bottle with gasoline, 
skake, and allow to settle. If the flour is unbleached, the gasoline will 
become distinctly yellow; if bleached, it will remain nearly colorless. 
It is well to conduct this test also with a known unbleached flour for 
comparison. 

FRUIT PRODUCTS. 

Adulteration of fruit products is practically confined to jellies and 
jams. Contrary to the general belief, gelatin is never used in making- 
fruit jelly. In the manufacture of the very cheapest grade of jellies 
starch is sometimes employed. Jellies containing starch, however, 
are so crude in their appearance that the most superficial inspection is 
sufficient to demonstrate that they are not pure fruit jellies. From 
their appearance no one would think it worth while to examine them 
to determine their purity. 

Natural fruit jellies become liquid on being warmed. A spoonful 
dissolves readily in warm water, althoug-h considerable time is required 
with those that are especially firm. The small fruits contain practi- 
cally no starch, as apples do, and the presence of starch in a jelly 
indicates that some apple juice has probably been used in its prepara- 
tion. (As stated above, jelly that has been thickened by starch paste 
will not be mistaken for fruit jelly.) 

DETECTION OF STARCH. 

Dissolve a teaspoonful of jelly in a half teacupful of hot water, heat 
to boiling and add, drop by drop, while stirring with a teaspoon, a 
solution of potassium permanganate until the solution is almost color- 
less. Then allow the solution to oool and test for starch with tincture 
of iodin, as directed on page 58. Artificially colored jellies are some- 
times not decolorized by potassium permanganate. Even without 
decolorizing, however, the blue color can usually be seen. 

DETECTION OF GLUCOSE. 

For the detection of glucose, a teaspoonful of the jelly may be dis- 
solved in a glass tumbler or bottle in 2 or 3 tablespoonfuls of water. 
The vessel in which the jelly is dissolved may be placed in hot water 
if necessary to hasten the solution. In case a jam or marmalade is 
being examined, the mixture is filtered to separate the insoluble mat- 
ter. The solution is allowed to cool, and an equal volume or a little 
more cf strong alcohol is added. If the sample is a pure fruit product 
the addition of alcohol causes no precipitation, except that a very 



58 FOOD ADULTERATION AND METHODS FOR DETECTION. 

slight amount of proteid bodies is thrown down. If glucose has been 
employed in its manufacture, however, a dense white precipitate sepa- 
rates and after a time settles to the bottom of the liquid. 

DETECTION OF FOREIGN SEEDS. 

In addition to the forms of adulteration to which jellies are subject, 
jams are sometimes manufactured from the exhausted fruit pulp left 
after removing the juice for making jelly. When this is done resi- 
dues from different fruits are sometimes mixed. Exhausted raspberry 
or blackberry pulp ma} 7 be used in making "strawberry" jam and 
vice versa. Some instances are reported of various small seeds, such 
as timothy, clover, and alfalfa seed, having been used with jams made 
from seedless pulp. 

With the aid of a small magnifying glass such forms of adulteration 
may be detected, the observer familiarizing himself with the seeds of 
the ordinary fruits. 

DETECTION OF PRESERVATIVES AND COLORS. 

With jellies and jams salicylic and benzoic acids are sometimes 
employed. They ma}' be detected by the methods given on pages 43 
and 44. 

Artificial colors, usually coal-tar derivatives, are sometimes used 
and may be detected as described on page 45. 

MEAT PRODUCTS. 

As in many other classes of foods, certain questions important in the 
judgment of meats require practical experience and close observation 
rather than chemical training. This is especially true of meat prod- 
ucts. The general appearance of the meat must largely guide the pur- 
chaser. If, however, the meat has been treated with preservatives 
and coloring matter its appearance is so changed as to deceive him. 
The preservatives employed with meat products are boric acid, borax, 
and sulphites. The methods for the detection of sulphites are not 
suitable for household use. 

DETECTION OF BORIC ACID AND BORAX. 

To detect boric acid (if its sodium salt, borax, has been used the 
same reaction will be obtained) about a tablespoonful of the chopped 
meat is thoroughly 7 macerated with a little hot water, pressed through 
a bag, and 2 or 3 tablespoonfuls of the liquid placed in a sauce dish 
with 15 or 20 drops of strong hydrochloric acid for each tablespoon- 
ful. The liquid is then filtered through filter paper, and a piece of 
turmeric paper dipped into it and dried near a lamp or stove. If boric 
acid or borax were used for preserving the sample the turmeric paper 
should be changed to a bright cherry-red color. If too much hydro- 
chloric acid has been employed a dirty brownish-red color is obtained, 



EXAMINATION OF SPICES. 59 

which interferes with the color due to the presence of boric acid. 
When a drop of household ammonia is added to the colored turmeric 
paper, it is turned a dark green, almost black color, if boric acid is 
present. If the reddish color, however, was caused by the use of too 
much hydrochloric acid this green color does not form. 

Caution. — The corrosive nature of hydrochloric acid must not be forgotten. It must not 
be allowed to touch the flesh, clothes, or any metal. 

DETECTION OF COLORS. 

The detection of coloring matter in sausage is often a difficult mat- 
ter without the use of a compound microscope. It may sometimes be 
separated, however, hy macerating the meat with a mixture of equal 
parts of glycerin and water to which a few drops of acetic or hydro- 
chloric acid have been added. After macerating for some time the 
mixture is filtered and the coloring matter detected by means of dyeing 
wool in the liauid thus obtained. (See p. 45.) 

SPICES. 

Although ground spices are very frequently adulterated, there are 
few methods that may be used by one who has not had chemical train- 
ing, and who is not skilled in the use of a compound microscope, for 
the detection of the adulterants employed. The majority of the sub- 
stances used for the adulteration of spices are of a starchy character. 
Unfortunately for our purposes, most of the common spices also con- 
tain a considerable amount of starch. Cloves, mustard, and cayenne, 
however, are practical^ free from starch, and the presence of starch 
in the ground article is proof of adulteration. 

DETECTION OP STARCH IN CLOVES, MUSTARD, AND CAYENNE. 

A half teaspoonf ul of the spice in question is stirred into half a cupful 
of boiling water, and the boiling continued for two or three minutes. 
The mixture is then cooled. If of a dark color, it is diluted with a 
sufficient amount of water to reduce the color to such an extent that 
the reaction formed by starch and iodin may be clearly apparent if 
starch be present. The amount of dilution can only be determined by 
practice, but usually the liquid must be diluted with an equal volume 
of water, or only one-fourth of a teaspoonful of the sample may be 
employed originally. A single drop of tincture of iodin is now added. 
If starch is present, a deep blue color, which in the presence of a large 
amount of starch appears black, is formed. If no blue color appears, 
the addition of the iodin tincture should be continued, drop by drop, 
until the liquid shows by its color the presence of iodin in solution. 

DETECTION OF COLORS. 

Spice substitutes are sometimes colored with coal-tar colors. These 
products may be detected by the methods given on page 45. 



00 FOOD ADULTERATION AND METHODS FOR DETECTION. 

VINEGAR. 

A person thoroughly familiar with vinegar can tell much regarding 
the source of the article from its appearance, color, odor, and taste. 

If a glass be rinsed out with the sample of vinegar and allowed to 
stand for a number of hours or overnight, the odor of the residue 
remaining in the glass is quite different with different kinds of vine- 
gar. Thus, wine vinegar has the odor characteristic of wine, and cider 
vinegar has a peculiar, fruity odor. A small amount of practice with 
this test enables one to distinguish with a high degree of accuracy 
between wine and cider vinegars and the ordinary substitutes. 

If a sample of vinegar be placed in a shallow dish on a warm stove 
or boiling teakettle and heated to a temperature sufficient for evapora- 
tion and not sufficient to burn the residue, the odor of the warm 
residue is also characteristic of the different kinds of vinegar. Thus, 
the residue from cider vinegar has the odor of baked apples and the 
flavor is acid and somewhat astringent in taste, and that from wine 
vinegar is equally characteristic. The residue obtained by evapora- 
ting vinegar made from sugarhouse products and from spirit and wood 
vinegar colored by means of caramel has the peculiar, bitter taste 
characteristic of caramel. 

If the residue be heated until it begins to burn, the odor of the 
burning product also varies with different kinds of vinegar. Thus, 
the residue from cider vinegar has the odor of scorched apples, while 
that of vinegars made from sugarhouse wastes and of distilled and 
wood vinegars colored with a large amount of caramel has the odor of 
burnt sugar. In noting these characteristics, however, it must be 
borne in mind that, in order to make them conform to these tests, dis- 
tilled and wood vinegars often receive the addition of apple jelly. 

As stated above, the cheaper forms of vinegar, especially distilled 
and wood vinegar, are commonly colored with caramel, which can be 
detected by the method given on page 48. 



LB '12 




f 18 ***] 



OF 



OOQr 



cohgh 



ESS 



3 ?b 



1?8 



u 



